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18 Mar 00:26

Super efficient grow light

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Mike sent in another one of his projects. This time it's a super efficient grow light for your plants. As usual, Mike has included all the schematics, parts list and PCB layouts to make your own. If you want to skip the fun part, you can also purchase one completed.

A grow light made from red and blue LEDs being pulsed. This light fits inside a Altoids container and requires less than 1.1W of energy to grow a 6"x6"x6" space. Lights can be chained to grow more plants. Total lumens = 111. Plants need primarily red (680nm) light to grow and a small amount of blue (440nm) light. By pulsing the LEDs at 720Hz or higher the plant can achieve maximum growth with a minimal amount of energy.

How to make a Super efficient grow light

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18 Mar 00:26

Wikihistory: sf story about the revert-wars among time-travellers -- "everybody kills Hitler on their first trip"

"Wikihistory" is a delightful science fiction short story by Desmond Warzel in the form of a series of messages posted to a time-travellers' forum -- it's basically a Wikipedia edit war, where the old hands have to keep on slapping down the noobs for killing Hitler:
International Association of Time Travelers: Members' Forum Subforum: Europe – Twentieth Century – Second World War Page 263

11/15/2104
At 14:52:28, FreedomFighter69 wrote:
Reporting my first temporal excursion since joining IATT: have just returned from 1936 Berlin, having taken the place of one of Leni Riefenstahl's cameramen and assassinated Adolf Hitler during the opening of the Olympic Games. Let a free world rejoice!

At 14:57:44, SilverFox316 wrote:
Back from 1936 Berlin; incapacitated FreedomFighter69 before he could pull his little stunt. Freedomfighter69, as you are a new member, please read IATT Bulletin 1147 regarding the killing of Hitler before your next excursion. Failure to do so may result in your expulsion per Bylaw 223.

At 18:06:59, BigChill wrote:
Take it easy on the kid, SilverFox316; everybody kills Hitler on their first trip. I did. It always gets fixed within a few minutes, what's the harm?

Link (via JWZ)

18 Mar 00:26

Custom turntables

Acrylic Turntable
Acrylic Turntable2-1

Mike Disher makes custom acrylic turntables -

About 5 years ago I decided to try my hand at building a custom turntable. Turntables and mechanical watch and clock movements fascinate me. I view them as functional pieces of kinetic art. I based my turntable design on the legendary Rega P3, and I created a new, custom acrylic plinth and a set of feet. I also devised a way to hide the motor, and I improved the motor mounting system. The plinth rests on small silicone dots, providing added isolation. The result was a very modern looking table. I called it the P3 Skeleton. Skeleton is a watchmaking term for a movement in which material is removed from the plates and bridges to reveal the inner workings. A fellow audio enthusiast saw this table at my house and offered to buy it on the spot. I did not sell it, but I was happy that others appreciated my work.
Beautiful work - love to see some pics of his build process as well.

Custom Turntables[via]


Related:

DIY Turntable

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18 Mar 00:25

Fun book: The Modern Con Man -- How to Get Something for Nothing

The Modern Con Man I love books about pranks, scams, bar bets, and cons. Not because I want to cheat people, but because scams and cons are a fascinating way to look at human nature. Sucker bets reveal our natural tendencies to be gullible, greedy, sympathetic, friendly, and suspicious.

A few books in this genre that I especially like are The Big Con by David Maurer, Pranks by Re/Search, How to Play in Traffic by Penn & Teller, The Big Book of Stuntology by Sam Bartlett, and Tricks with Your Head: Hilarious Magic Tricks and Stunts to Disgust and Delight by Mac King and Mark Levy.

The Modern Con Man -- How to Get Something for Nothing, is another book in the same genre. Written by "America's last sideshow entertainer," Todd Robbins, this book is filled with cheap sucker bets that, if used will win you either free drinks or a punch in the nose.

You'll learn how to:

• Almost always win at the game of Nim (where you dump 20 matchsticks on the bar, and take turns with another player by removing one, two, or three matches from the pile in the hopes of leaving the other player with the last match, making you the winner)

• Tie a knot into a necktie by holding each end of the tie in one hand and not letting go.

• Hold a lit match upside down for 20 seconds without getting burned,.

• Beat a sucker with lots of seemingly can't-lose card and coin tricks.

My 10-year-old daughter loved all the tricks I showed her. Most of these short cons are delightful for both the prankster and the mark, unless they involve large wagers. Perform them at your own risk. Link

18 Mar 00:25

Fun with ignition coils

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Ignition coils are a cheap way to have some high voltage fun. You can usually find them in old cars or a used parts shop. They need a special circuit to work outside of the car; fortunately it's fairly easy to make one.

Ignition coils are essentially pulse transformers. Transformers that work using pulses of current, instead of standard alternating current. These pulses that are applied to the primary coil are magnified and the voltage appearing from the secondary coil can be up to about 40kV.

Have some fun with ignition coils.

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18 Mar 00:23

The Merck/Merial Manual for Pet Health

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The Merck Veterinary Manual has long been the standard guide found in most veterinarian's back offices. Vets are required to serve the needs of many animals, not just one, and so this venerable book is their operating manual for lesser known species. It also serves as a reminder for uncommon ailments in the common species of pets. Recently Merck/Merial has published a one-volume paper-bound home edition of the Vet Manual. It is less technical, but still remarkably deep, and by far the best pan-species health guide for pets. It is often even better than many single pet health guides.

Besides the expected dogs, cats, and horses, it covers the health needs of rabbits, rodents, ferrets, birds, reptiles, and exotics such as pot-bellied pigs and sugar gliders. At 1,300 pages, it's an old-fashioned book, but intelligently designed, and easy to browse and study.

This book won't eliminate visits to the vet, but it will reduce their number, and make you smarter when you do visit. The real value of a pan-animal tome like this is when you take charge of an unfamiliar animal. It also gave us confidence to adopt pets we hitherto knew little about.

-- KK

The Merck/Merial Manual for Pet Health
1300 pages, 2007

$16
Available from Amazon


Sample excerpts:

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Ear mange mites cause inflammation of the ear canal and skin disease in cats.

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Hunched posture or fluffed fur in a hamster may be signs of illness.

Scale rot (ulcerative or necrotic dermatitis) is seen in snakes and lizards. Humidity and unclean environments appear to be the main factors that cause this condition. Moist, unclean bedding allows bacteria and fungi to multiply. When coupled with exposure to animal droppings, this can cause small skin sores. Secondary infection with other bacteria may result in septicemia and death if untreated. Reddening of the skin, death of the skin tissue, slow-healing sores on the skin, and a skin discharge are common.

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Bacteria often cause shell disease in turtles and scale rot in lizards and snakes.


Related items previously reviewed on Cool Tools:

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Tarantula Keeper's Guide

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Merck Manual, Second Home Edition

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Natural Goat Care

18 Mar 00:23

Фотограф Serefel





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18 Mar 00:22

Фотограф Baldovino Barani





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18 Mar 00:22

Review Board is good software

After having tried and failed to have useful code reviews at several different companies, and after feeling deep envy for Mondrian, Google's web-based code review tool, I'd been looking for some tool that would help make code reviews more painless. I think I've found what I was looking for in Review Board.

Code reviews usually amount to infrequent lunchtime sessions where some poor engineer's code gets put on a projector and strip-searched by the whole engineering group at once. It's not a fun experience for anyone, and post-traumatic stress or severe empathy often result in the next session mysteriously taking several weeks or months to make it onto the calendar. Public humiliation has its place, perhaps, but as a last resort -- attempts to make it regular, good sport usually fail on the launchpad.

Yet good code reviews -- as hard as they are to find -- can produce great effects. There's no better way to learn how to improve your code than to have someone look over it carefully and make suggestions line by line. I've been impressed by the results that teams using careful code review report: that making changes and fixing bugs in the code is relatively easy, since everything is fairly clean and accessible. Great code review makes bugs more shallow.

There are a few web-based tools for code reviews. Mondrian isn't available outside of Google, but Codestriker (Perl-based) has been around for a while, and Crucible from Atlassian has a nice UI and good features -- but a US$2,400.00 starting price point, including the required FishEye server.

I spent a ton of time getting Crucible set up, but before taking the plunge I decided to take one more look for alternatives, and stumbled on Review Board. It's a Django/Python-based open source project, and it seems to have an active and responsive community. The documentation for getting it set up is a little thin, but it still took far less time than Crucible to get going. The UI isn't quite as nice, but it's serviceable, and the iPhone/JSON API/Git & Mercurial & SVN & Perforce & CVS support all turned my eye. Also, I like that Review Board allows pre-commit reviews, which Crucible as yet does not.

You can immediately see why Review Board is going to be a great open source project when you submit a patch. All patches are, of course, code reviewed using Review Board, and nobody working on the project is going to let a minor glitch go by. My first patch got an immediate "no way"; later patches (such as this one) were up to snuff. I've learned a couple of tricks already from the review comments, and I definitely am spending more time getting things right before submitting.

Take a look through the project launch post and you'll see what the authors are going for. I have Review Board set up at our office, and I'm psyched to give it a try and see how it goes. It's great to see such a healthy project in this area, and I hope it continues to grow and go well.

18 Mar 00:21

Wrenching and beautiful before-and-after-death photos


German photographers Walter Schels and Beate Lakotta have a show of their extraordinary before-and-after-death photos opening on April 9 at the Wellcome Trust in London. The photos are marvellous and wrenching, the difference between flesh animated and the empty vessel gigantic and unmistakable, even when the before-death shot is of someone terribly ill. Life's marvellous and inexplicable.
Rita Schoffler, 62
First portrait: February 17 2004
Rita and her husband had divorced 17 years before she became terminally ill with cancer. But when she was given her death sentence, she realised what she wanted to do: she wanted to speak to him again. It had been so long, and it had been such an acrimonious divorce: she had denied him access to their child, and the wounds ran deep.

Second portrait: May 10 2004
When she called him and told him she was dying, he said he’d come straight over. It had been nearly 20 years since they’d exchanged a word, but he said he’d be there. “I shouldn’t have waited nearly so long to forgive and forget. I’m still fond of him despite everything.” For weeks, all she’d wanted to do was die. But, she said, “now I’d love to be able to participate in life one last time…”

Link

18 Mar 00:21

Repairing paperbacks

ironSpine.jpg

By way of Mister Jalopy and Dinosaurs + Robots comes this interesting tip on repairing paperback book covers by reheated and reseating the cover to the spine. I'm definitely going to try this (first on an expendable title, as suggested).

Ironing Paperback Spines


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18 Mar 00:06

Even more Beautiful Code (C → Haskell)

In the book Beautiful Code some code is more beautiful than other code. But there is little doubt that the opening chapter presents a regular expression matcher in a beautifully succinct fashion. As the author Brian Kernighan states: “I don’t know of another piece of code that does so much in so few lines while providing such a rich source of insight and further ideas.”
18 Mar 00:06

Gallery: Will Wright Walks Us Through 'Spore'

The creator of The Sims tells us about his grandest project yet -- a life simulator that goes all the way from bacteria to space exploration.

18 Mar 00:06

Kathy Sierra: Creating Passionate Users at TOC

By Tim O'Reilly

We'd hoped to get Kathy Sierra at our Tools of Change for Publishing conference, but had to settle for a video. I interviewed Kathy a couple of months ago about her approach to creating passionate users via the "I rule" moment, what publishers of all stripes (as well as anyone making presentations) can learn from her ideas about storyboarding non-fiction, as well as such things as why people are turned on by learning new skills, and why every day can be a kind of hero's quest.

That turns out to be good news, since we can share that video with you. (More video from the conference coming soon.)

18 Mar 00:06

Trying to break the JCB Toughphone

Picture 8

When I met Bob Plaschke, top chap at Sonim Technologies, a few weeks ago, he arrived with two JCB Toughphones. One was for me to play about with — a review unit — the other was for me to smash.

I smiled when he arrived. Anyone else would have done a fake smile, I think — me, I was far too concerned about the possibility of trying to smash a handset (especially with it’s ultimate owner sat opposite me). Sacrilege.

You couldn’t meet a nicer chap than Bob, which made it doubly hard to walk out into the forecourt of the Four Seasons in Palo Alto and have a go at trying to smash up the world’s premiere unsmashable handset. Egged on by Bob, I took threw the handset about 5 ft in the air and made a stupidly girly face whilst I waited for it to hit the cobbled stones.

Nothing.

The handset bounced once or twice and came to a rest.

“Right,” exclaimed Bob, “Switch it on, let’s try it out…”

A few seconds later, the JCB had switched on and was operational.

“That’s fantastic,” I said, astounded at the solid nature of the handset as I made to walk back into the hotel.

“Ok, but really throw it this time,” ordered Bob, handing me back the device.

I did a blank look at him. We’d proved the point. The device worked.

But Bob — correctly — wasn’t having any of that.

“REALLY throw it. I mean REALLY — as hard as you can, I want you to break this one, it’s excellent feedback for our team,” he instructed.

I’m firmly from the school of thought that every time you kill a handset like I’d been trying to do here, a small cute fairy dies somewhere — so this is difficult work for me.

Bellhops, the ladies on reception and the diners at the Four Seasons restaurant were all peering out at me as I took another step forward and three the JCB handset about… what… 45 feet in the air.

It landed with a sickening smashing.

I closed my eyes, expecting Bob to utter a few phrases like, “Er, well… well done…”

Opened my eyes.

No, there it was. Sat on the stone floor, fine. Turned it on. Geez, it’s solid.

“So, no messing about this time Ewan, really, really throw it…” Bob says, as he hands me back the handset.

I’m contemplating just how far I can throw the JCB as Bob starts hunting around for something to slam the handset into that might actually cause some damage.

Determined not to let the viewing public at the Four Seasons down, I summoned a considerable amount of strength and threw the handset as hard and as fast as I could up into the air.

I still couldn’t watch it hit the floor.

It landed — and this time — ah hah! Result!

After an eighty feet fall (I think it must have been about 80ft, I didn’t measure it), the handset came spinning down and smashed open.

“Oh arse,” I thought, thinking of a little fairy popping out of existence.

“Hmm let me see,” says Bob, pouring over the handset’s casing, eager to see exactly what happened. I note that the device itself is perfectly fine apart from mild scratching of the plastic sides (”that rubs off, look,” demonstrates Bob). I look to the floor and see that the battery and it’s casing were on the floor.

“Ah yes,” says Bob, “See here, it came down with such force that the little latch we use to keep the battery in place broke,” he continues, “But the phone will still work fine, watch.”

You know how if you drop your Nokia N95 on a hard floor from about 2ft — if it falls from a desk or something — and it smashes open — battery, battery compartment and device? That’s what happened. Only this was from 80ft. And the device still worked fine.

“We identified that vulnerability a while ago,” says Bob, busy putting the battery and case back on, “It’s already fixed in the next version.”

Wow.

A few seconds later, the JCB screen lights up and it’s making a call. Amazing stuff.

“Ok, again,” says Bob, “I want to prove to you that this thing is indestructible!”

100ft. 150ft lob. Slamming on the ground as hard as possible. All fine.

“Blender?” I asked.

“We tried that,” Bob grins, “But the handset broke it.”

“Car?”

“Fine. Anything. A tank, if you’ve got one.”

Er. No tanks spare that I could see in Palo Alto, so I took Bob’s word for it. I believe him too.

The handset operates in all sorts of conditions and copes with nearly everything your general sane individual can throw at it. (I’m talking temperature, heat, dropping and so on — not chainsaws and incinerators). This model, the XP1, is even splash proof. There’s another one coming out soon, Bob tells me, that will be entirely waterproof to some ridiculous level. And it’ll float.

Who will buy one? Apart from ultra geeks like me? Well, lots of people who don’t want their regular handset to break at the slightest hint of mistreatment: Builders, sailors, adventure enthusiasts, skiers…

… speaking of which… I’m in Tahoe right now. Outside the mighty Lake Tahoe stretches away — a pale blue expanse of 700 year old water, surrounded by lots and lots of mountains. All of which have snow on them.

So I’m taking the JCB skiing with me. I’m going to subject it to the elements — and I’m going to make a call with it from the top of the mountain and see how it performs.

More shortly.

18 Mar 00:05

Next Nature -- a designer's vision of a nature overtaken by corporatism


Bruce Sterling called designer Mieke Gerritzen's presentation at the LIFT conference in Geneva "the freakiest, most-out there" presentation at the event. Gerritzen's talk is on "Next Nature," the way that corporatism and nature will mesh more and more as time goes by -- think of butterflies gengineered with corporate logos. The talk is a heady mix of what-if and have-you-seen, and manages to make my head swim every time I watch it. Link

18 Mar 00:05

MIT prof's notorious talk on How to Talk


MIT prof Patrick Winston gives an infamous annual talk called "How to Talk," a lecture on how to give good lectures. It's open to students and, apparently the public. This 1999 version of the talk (pre-Powerpoint!) is filled with damned good advice on persuasive public speaking, delivered in the form of "heuristics" that you can use to guide your own presentations. Link

18 Mar 00:05

Scalzi's Old Man's War as a free download

John Scalzi and Tor are making his groundbreaking novel Old Man's War available as a free download as part of the runup to the launch of Tor's killer new sf supersite. There are plenty of other titles available too -- you just need to sign up to get an email notifying you of more cool free stuff from Tor. Link

18 Mar 00:05

Library built into a staircase

The stairs going up to the attic room of a Victorian row house in London have been fitted with books that line each riser and wrap around the edges. As someone who lives in small places with lots of books (and no matter what I do, no matter how ruthless I am, I always seem to have lots more books that I have room for) this kind of thing is sheer aspirational porn for me.

The flat occupies part of the shared top floor of an existing Victorian mansion block. Our proposal extended the flat into the unused loft space above, creating a new bedroom level and increasing the floor area of the flat by approximately one third. We created a 'secret' staircase, hidden from the main reception room, to access a new loft bedroom lit by roof lights. Limited by space, we melded the idea of a staircase with our client's desire for a library to form a 'library staircase' in which English oak stair treads and shelves are both completely lined with books. With a skylight above lighting the staircase, it becomes the perfect place to stop and browse a tome. The stair structure was designed as an upside down 'sedan chair' structure (with Rodrigues Associates, Structural Engineers, London) that carries the whole weight of the stair and books back to the main structural walls of the building. It dangles from the upper floor thereby avoiding any complicated neighbour issues with the floors below.
Link (Thanks, David!)

18 Mar 00:03

Haunting sf story podcast: "Edward Bear and the Very Long Walk"

This week's story on the science fiction podcast Escape Pod is "Edward Bear and the Very Long Walk," a haunting Ken Scholes tale about an animatronic AI Winnie the Pooh toy aboard a doomed, pandemic-wracked survival ship, tasked with saving the human race.
“Do you know what’s happened to the children?”

Edward swallowed. Suddenly, he wanted to cry. “Yes. They’re…sleeping?”

He hoped and hoped and hoped and hoped, grimacing as he did. He looked around.

Makeshift beds lined the room. Small hands gripped blankets, small eyes stared at the ceiling.

“No.” The boy frowned. “They’ve died.”

“Because of Something Very Bad?”

“Yes. And I need you to be a Very Brave Bear. Can you do that?”

Link, Subscribe to podcast feed

18 Mar 00:02

Wind turbine self destructs (video)


"The braking mechanism that limits the speed of the wind turbine broke during a storm in Denmark. This was the outcome." Article about the turbine failure

17 Mar 23:55

HOWTO make tin stars out of soda cans


Craftster user Teag has posted a great, simple HOWTO for making these decorative tin stars out of soda cans. Link (via Craft)

17 Mar 23:51

Path Intelligence Monitors Foot Traffic in Retail Stores By Pinging People’s Phones

pathintelligence_logo.pngAnalytics have turned shopping sites into finely tuned machines, enabling publishers to efficiently direct the flow of traffic around a site. However, the same can’t be said for their real-world counterparts. Aside from running tests using video tapes and infrared counters, there’s no comprehensive way for businesses to monitor how customers are flowing through their space. That was until Path Intelligence came along.

pathscreensmall.pngPath Intelligence is a U.K. based company that monitors foot traffic in a rather ingenious way, through customers’ cell phones. Periodically our cell phones ping the nearby cell towers basically saying “Here I am”. Path Intelligence has built receivers that detect these signals and triangulate the owner’s location with accuracy of up to a meter.

Each ping also includes the cell’s unique identifier (think IP address). While these IDs help track the movement of the signal and it’s owner, they don’t reveal the identity of the user. Only your service provider knows that. This is a similar, but more precise method than Google Maps is using to detect your general location on your mobile phone by cell tower.

Path Intelligence can then map these signals and track anonymous customers as they move around and answer questions about the store’s layout through online reports. Where are the bottle necks? Where do customer’s spend the most time. How many customers browse and go? You can see the demo here.

The company is currently only launched in the U.K. Possible future plans include allowing users to tie their phone number to their signal ID so they can get special offers (hopefully not spam) linked to their location or other similar location based services. The company has raised about $1 million so far led by Tim O’Reilly’s AlphaTech Venture Partners.

path intelligence Loading information about path intelligence…

Crunch Network: CrunchBoard because it’s time for you to find a new Job2.0

17 Mar 23:20

Jenny Morgan | Artist; gallery

by superfamous