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Judgey: Web game that lets you judge a book by its cover

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Judgey is a fun site that lets you rate a book's cover, then see if your rating matches up with its Goodreads rating. Great way to remind yourself of all the bad design in the world!

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Video: HOWTO make a paper cannon

You probably already have all the stuff you need to make this nifty paper cannon that fires at a surprisingly high muzzle velocity.

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Video: HOWTO make a 3D origami Darth Vader

Origami enthusiasts have created a number of small foldable units that can then be assembled into all kinds of 3-D shapes, like this Darth Vader.

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WATCH: Slide for 1/3 of a mile on world's longest waterslide

New Jersey's Action Park is legendary for crazy rides, and now it has a water slide that's about one-third of a mile long. Above: a ride by park employee Jasosn Mulder, including a mid-air corkscrew flip.

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WATCH: Water balloon with guy inside pops in slow-mo

The Slow Mo Guys popped a six-foot water balloon after Dan struggled valiantly to squeeze inside. It's equal parts hilarity and suspense as the inevitable pop gets closer.

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How to fill 40 water balloons all at once, for an awesome water balloon battle

“Filling up 40 balloons automatically makes for a much faster balloon fight.”

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Incredible Science Machine team seeks Rube Goldberg record with chain reaction gizmo

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Chain reaction artists and domino builders have collaborated to create what they hope will go on record as the largest chain reaction in history.

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Video: HOWTO make waterproof sand at home

YouTuber IncredibleScience has a great at-home science project that's kid-friendly: making waterproof sand.

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WATCH: 8 great DIY smartphone photography tips

Cooperative of Photography released a great video with 8 DIY tips to improve your smartphone shots, ranging from super-simple and cheap to fairly simple and maybe cheap.

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Dream Recollection Inducer

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“Dream Recollection Inducer (GIF Format)—To gaze at shortly after waking.” By ZBAGS.

'Alien' piñata

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The Alien from Ridley Scott's 1979 horror sci fi classic.

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WATCH: Kid vs. kite. Spoilers: kite wins

A very talented kite enthusiast at the Huntington Beach Pier had some fun playing tag with a kid.

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Watch "Do Try This At Home," science series using common items

At-Bristol's Live Science Team has a wonderful video series of experiments that can be done with inexpensive materials available at typical hardware, kitchenware, and grocery stores, like turning water into instant ice.

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Mermaid convention photographs by Arthur Drooker

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Cool Hunting continues its wonderful Conventional Wisdom series by following photographer Arthur Drooker to Merfest, a mermaid convention in North Carolina.

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Just look at these spooky banana ghosts

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Just look at 'em with their evil chocolate chip eyes. Part of Let's Go Chipper's series on healthy Halloween snacks in the run-up to Saint Beetus Day. Also:

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Rubber band ball

badballI know this rubber band ball is durable because my wife ran over the box with her car without damaging the rubber bands. The manufacturer claims it has at least 270 rubber bands in it.

Rubber band ball ($5)