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Deep math of the folded pizza slice

Deep math of the folded pizza slice
Gear  |  Other
Why does a flat pizza slice flop over unless you bend it into a curve? Thank Gaussian curvature, the 19th century mathematical principle that underpins everything from corrugated cardboard to eggshells to Pringles chips.
 Wired's Aatish Bhatia uses the pizza-slice as a jumping-off point to explain one of the most elegant and fascinating parts of geometry, and once you read his work, you'll never be able to look at a curved surface again:
"Well, the pizza slice was flat before you picked it up (in math speak, it has zero Gaussian curvature). Gauss’s remarkable theorem assures us that one direction of the slice must always remain flat — no matter how you bend it, the pizza must retain a trace of its original flatness. When the slice flops over, the flat direction (shown in red below) is pointed sideways, which isn’t helpful for eating it. But by folding the pizza slice sideways, you’re forcing it to become flat in the other direction – the one that points towards your mouth. Theorema egregium, indeed.
By curving a sheet in one direction, you force it to become stiff in the other direction. Once you recognize this idea, you start seeing it everywhere. Look closely at a blade of grass. It’s often folded along its central vein, which adds stiffness and prevents it from flopping over. Engineers frequently use curvature to add strength to structures. In the Zarzuela race track in Madrid, the Spanish structural engineer Eduardo Torroja designed an innovative concrete roof that stretches out from the stadium, covering a large area while remaining just a few inches thick. It’s the pizza trick in disguise
." [ link ]
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Sleepy cat hugs a doll

Gear  |  Pet
Cute!
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Timelapse-Making Of a Bookshelf

Gear  |  Video
"This is the fully animated story of making four bookcases. The four cases are made from two pieces of walnut veneer plywood with almost no waste. The base for the cases is made from solid walnut with mitered corners The bookcases are 33 inches tall and 47 inches wide. The finish is wipe on polyurethane. They fit under and within the spacing of the windows in the living room.
 I shot approximately 11,700 frames for this animation and used roughly 6,400 of them. I worked on this project intermittently from the 5th of January to 1st of March, 2014."
Source

TiVo Unveils Mega, The Largest DVR It’s Ever Sold

TiVo Unveils Mega The Largest DVR It  s Ever
Gear  |  Gadget
TiVo is now offering the TiVo Mega to customers: a giant 24TB  RAID 5 hard drive system that can fit up to 26,000 hours of content (4,000 hours in HD). Other features include six tuners for recording multiple shows at once, built-in streaming to your phone or tablet, both at home and over the Internet, universal search across cable, VOD, and web apps like Netflix and YouTube, multi-room, whole-home support, and a slide-out keyboard remote to make those searches a breeze. The TiVo Mega is expected to be available in Q1 2015 for about $5,000.
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Canyon Urban Bike

Canyon Urban Bike
Gear  |  Bike
The cockpit is fully integrated into a single unit and the front and rear lights are also embedded into the frame, giving Urban Concept Bike a highly distinctive, yet elegant appearance. The  Canyon Urban features  including a Gates sprocket and belt, Shimano brakes and rear derailleur, and San Marco custom leather grips and saddle .
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Teens React To Nintendo (Nes)

Gear  |  Video
The Teens react to the classic Nintendo console, NES!
Source

Gif: View

Gif View
Gear  |  Pic
waterfall
Source

iPrank Cracked Screen Stickers

iPrank Cracked Screen Stickers

iPrank Cracked Screen Stickers
Gear  |  Apple
One way to get someone's attention, I suppose....  
$10.
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Hair: Expectations vs. Reality

Hair Expectations vs Reality

Hair Expectations vs Reality

Hair Expectations vs Reality
Gear  |  Pic
"my hair and i have a very complicated relationship" by fara tit.
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Lightweight Exoskeleton Lets You Run 10% Easier

Lightweight Exoskeleton Lets You Run 10 Easier
Gear  |  Tech


Jason Kerestes is a graduate student at Arizona State University. With support from DARPA, he has developed the AirLegs exoskeleton. It's a small machine worn on the back that decreases the metabolic cost of walking and running by about 10% versus not wearing the machine.
"This device was tested at the Army Research Laboratories in September 2013 and demonstrated a 10% reduction in metabolic cost (compared to no device) for users running at high speeds. It is the only device known to the US Army to oficially augment the human running gait cycle."
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Gif: Wind

Gif Wind 80625360310729815
Gear  |  Pic
Fan.
Source

5 Crazy Ways Social Media Is Changing Your Brain Right Now

Gear  |  Video
5 Crazy Ways Social Media Is Changing Your Brain Right Now
Source

Time-Lapse of the Beautiful Spots in California

Gear  |  Video
"California is the most populated state in the United States, and the third largest. It's almost double the size of the United Kingdom and slightly larger than Japan. If it was it's own independent country (as it was briefly for a few weeks in 1846), it would have the 8th largest economy in the world by GDP. It contains the highest summit and the lowest desert in the Contiguous United States (and the second-lowest point in the world), both of which are in the same county. It's most known for movies, technology, wine, and national parks, but also grows more than a third of the vegetables consumed in the US, two-thirds of the fruits and nuts, and an unknown but presumably huge percentage of marijuana. It contains every major climatological biome except tundra. More important than those facts, to me, is that I was born and spent most of my life here. "
Source

Where is this?

Where is this 148588426343001602
Gear  |  Pic
Where is this?
Lake Powell & Reflection Canyon, Glen Canyon National Recreational Area, Utah. [Thanks Robin]
Source

DIY Motorized Couch

DIY Motorized Couch
Gear  |  DIY


Led by Steph McArthur and Will Andrew, the UNSW students built a custom steel chassis equipped with four independently controlled Mecanum wheels, which use multiple rollers instead of a single tire to achieve omnidirectional movement. Its wheels are powered by electric scooter motors. The students use a gamepad  to steer the couch while they chill on it.
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Noke Bluetooth Padlock

Noke Bluetooth Padlock
Gear  |  Gadget
Noke is a bluetooth padlock, you will never  lose keys and forget your keys. Using its iOS or Android app, Noke finds and pairs your Bluetooth 4.0 enabled smartphone.
To unlock Noke, simply press the shackle. Noke wakes up and searches for your phone or a shared phone. If the phone is within a few feet, Noke will instantly unlock so you can be on your way. No need to launch an app or remove your phone from your pocket or purse.
If you have a specific reason to limit the range or turn off the auto-unlock feature, you can do this within the app. In order to unlock with the auto-unlock feature turned off, you can simply press unlock button in the app or use Quick-Click code. This will allow you to lock your phone in a locker or stand near your lock without fear of it being unlocked. You can also set up push notifications in the app if you'd like to know when Noke is being opened.
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Batman Branding Iron

Batman Branding Iron
Gear  |  Gadget
NiqueGeek’s Batman Branding Iron. 3D printed of steel, this miniature branding iron snaps right onto a standard, ubiquitous Bic lighter and features a large Batman insignia. Simply light up and hold the flame on the metal end for about 60-90 seconds and then brand away! Good idea.
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BBC Coast - The Netherlands

Gear  |  Video
The Dutch are masters in water management. Without their ability to 'manage' the seawater, river water and groundwater, much of the low-lying Netherlands would be under water.
This video shows the astonishing man-made shoreline of the Netherlands. Nick Crane explores how ingenious Dutch engineers created massive coastal defences following the great North Sea flood in 1953 which killed thousands of people in the Netherlands.
Source

Giant Bag Clip

Giant Bag Clip
Gear  |  Other
From websites:
•••••••••••••••••••••
The Handy Camel is a tight sealing clip and convenient carrying handle for large bags, such as potting soil, fertilizer, pet food, ice salt, bird seed, BBQ charcoal, and more.
Just slide it around the bag's opening, clip it shut, and the round teeth inside securely grip the bag without tearing it, while the ratchet locking system creates a tight spillproof seal.
As handy as this would be for various household projects and pets, it's also great if you have a massive bag of potato chips.

•••••••••••••••••••••
$11.99.
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Toilet Lounge Chair

Toilet Lounge Chair
Gear  |  Pic
Toilet Lounge Chair
Source

Time-lapse Video Of An Amish Barn Raising

Gear  |  Video
A 10 hour, 3 minute and 30 second barn raising condensed into three and a half minutes.
Source

Riding a Spaceship Back To Planet Earth

Gear  |  Video
This genius prankster who brought a blow up spaceship with him on a skydiving jump from a hot air balloon
Source

Experience the power of the New Ikea bookbook

Gear  |  AD
"At only 8mm thin, and weighing in at less than 400g, the 2015 IKEA Catalogue comes pre-installed with thousands of home furnishing ideas."
Source

Sake Making Kit

Sake Making Kit
Gear  |  DIY
"Traditional Japanese sake production can be complicated and exacting, but this kit makes it easy with everything you'll need (except 1 lb. of white raisins and 2.5 lbs. of sugar) to brew multiple one gallon batches of your own sake in a hands-on exploration of ancient art and science. Hailing from Nara period Japan (8th century CE), sake is a time-honored rice "wine" steeped in Japanese culture, but you can bring a bit of this rich tradition to your kitchen without a trip to Kobe's legendary breweries. "
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Price: $57   |   BUY

A giant white rabbit by Florentijn Hofman

A giant white rabbit by Florentijn Hofman
Gear  |  Projects
Dutch artist Florentijn Hofman's latest creation, a giant rabbit, reclines on an old aircraft hangar at the Taoyuan Land Art Festival in Taoyuan, Taiwan. The organizer said the rabbit is the second piece of art work following Hofman's rubber duck for the coming Mid-Autumn Festival and will be displayed between September 4 and 14 at the Taoyuan military base. Hofman's big yellow duck drew millions of visitors when it toured the island last year, and festival organizers are hoping the rabbit will do the same. (Photo by Wally Santana/AP Photo)
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Diving into an Active Volcano

Gear  |  Video
This video is about Marum Volcano Expedition
Source

Panda

Panda 175294780229224094
Gear  |  Pic
Cute.
Source

Meet the Laniakea supercluster

Gear  |  Video
"Superclusters – regions of space that are densely packed with galaxies – are the biggest structures in the Universe. But scientists have struggled to define exactly where one supercluster ends and another begins. Now, a team based in Hawaii has come up with a new technique that maps the Universe according to the flow of galaxies across space. Redrawing the boundaries of the cosmic map, they redefine our home supercluster and name it Laniakea, which means ‘immeasurable heaven’ in Hawaiian.  "
Source

Volcano Eruption In Papua New Guinea Will Blow Your Mind

Gear  |  Video
The eruption of Mount Tavurvur volcano on August 29th, 2014.
Source

Jumbo Shrimp

Jumbo Shrimp
Gear  |  News
The Florida Fish and Wildlife Conservation Commission posted some pictures of a shrimp to its facebook.
Steve Bargeron was fishing from a dock in Fort Pierce as he watched a fellow fisherman pull this creature out of the water. Steve said the massive thing was about 18 inches long and striking its own tail, so he grabbed it by its back like a lobster. Scientists think it may be some type of mantis shrimp.
That’s a large shrimp!
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