Watch how smartphones plus RF imaging can detect motion through concrete and stone

The Action Lab set up an interesting proof of concept using a smartphone plus a cheap radio frequency 3D imaging doo-dad to sense motion in another room. Read the rest

Watch a waterjet slice a perfect obsidian cube and some batarangs

The guys from Waterjet Channel took a request from a Minecraft fan who wanted to see them cut an obsidian cube, even supplying the obsidian. They also made some super-thin batarangs that could almost be used as sunglass lenses. Read the rest

Watch how to use dry erase markers to make writing that floats

SoCraftastic tested six marker types on a non-porous surface to see which one allowed the ink to float on water. The effect is pretty cool with a stick figure. Read the rest

Gorgeous resin sphere turned on a lathe

Heath Knuckles created this beautiful burl and resin sculpture he names "Red Dawn." A very satisfying and relaxing video, in large part thanks to the great music choices. Read the rest

Programmer demonstrates his "perfect" Minesweeper AI

Code Bullet claims in this demo video, "I was able to create what I believe to be a perfect minesweeper player." Read the rest

Watch traffic flow better in 30 simulations of a 4-way intersection

YouTuber euverus modded Cities: Skylines to demonstrate how 30 different types of intersections have dramatically different amounts of traffic flow. A four-way intersection with no traffic lights gets a flow of 191 vehicles per minute, where a stack interchange can handle 1099 vehicles in the same time frame.

The mods used, Traffic Manager: President Edition and Network Extensions 2, are both available for free on Steam.

The big surprise for me was the roundabout, because we rarely have them in the Midwest or the West Coast. They seemed like a lot of extra space needed for an incremental benefit, but it appears they can be more efficient and safer, even weird ones.

Traffic flow measured on 30 different 4-way junctions (YouTube / euverus) Read the rest

Artist creates curly wire sculptures that spell words with their shadows

Sculptor Fred Eerdekens created aluminum and copper works that look like abstract squiggles until lit from the right angle. When lit just right, each spells out a word. Read the rest

Charming birdhouses that look like retro camping trailers

Nashville maker One Man One Garage created these fun flat-pack birdhouse kits that assemble into vintage campers. Read the rest

Watch this energetic lady fake hula hoop across town

Josh King directed this delightful video for Texas-based Khruangbin's song Evan Finds The Third Room. The casting is perfect, and her smiling is infectious. Read the rest

Artist adorns trash with vibrant sculptures resembling coral and mushrooms

Stephanie Kilgast makes lovely sculpted work with environmental and nature themes, like this old can she painstakingly covered with brightly-colored sea creatures, flowers, and mushrooms. Read the rest

New York City: Kick off the weekend by buying cookies from these homeless Girl Scouts

Do you live in New York City? Do you like cookies? Are you into cookies so hard that you carry cash with you, just in case the opportunity to buy cookies arises while you're going about your day?

If you answered yes to any or all of these questions, read on.

The girls of Girl Scout troop 6,000 all have one thing in common: They all live in homeless shelters in New York City. Troop 6,000 came into being back in March of 2017 thanks to a partnership between the Girl Scouts of Greater New York and New York City's Department of Homeless Services. Currently, troop 6,000's membership includes kids from 15 different homeless shelters in the NYC area. This year, the girls of the troop are selling Girl Guide cookies for the first time:

From Eyewitness News 7 NY:

"The biggest impact that we see and when you talk to the girls you'll hear them say, is that they belong to something, they have a sisterhood within the other Girl Scouts," said Meredith Maskara of the Girl Scouts of Greater New York. "They talk to other girls who may be in their same situation who feel alone, and they feel like they have a stronger sense of community and belonging overall."

Buying any Girl Scout cookies, which are the crack cocaine of sugary treats, is a win. Buying them from troop 6,000? That's way more cool: not only will doing so help to grow the bonds of friendship and belonging in a group of disenfranchised children, the cash you fork over will also help those kids to take part in amazing experiences that may have been all but unattainable to them, otherwise. Read the rest

Drones find over 50 new enormous artworks etched into the Peruvian desert

National Geographic reports exclusively on a project in Peru using low-altitude drones to identify dozens of ancient geoglyphs undetectable by the unassisted human eye. Read the rest

Watch surfers try out train-powered waves at Slater's surf ranch

Surfer Magazine recently headed over to Kelly Slater's Wave Company, a humongous wave-generating engine on rails that lays out glassy slab after slab. Read the rest

Learn how to wrap ten unusual shaped items

Most of us are pretty good at wrapping a cube or cuboid box, but this handy video shows how to wrap a bunch of weird shapes, including pyramids, cylinders, and those annoying cardboard-backed blister packs for things like tools and action figures.

I needed to wrap a popcorn tin the other day, and this was very handy. It looked way better than my gifts usually do! And as for opening the package itself, that's another matter.

How to Wrap 10 Challenging Shapes! (YouTube / Paper Guru) Read the rest

MIT students create and circulate open source, covert RFID rings to subvert campus tracking system

A reader writes, "A couple years ago MIT changed their dorm security/student tracking policy. They hired security contractors to work in dorms and required everyone to tap their RFID cards upon entry (no vouching for friends/guests). Most students complied. Some moved out. Some got in trouble ;)" Read the rest

Delightful petri dishes filled with wool and felt fungi

Elin Thomas uses real petri dishes and fills them with beautiful crocheted felt and wool spores, mold, and fungi. Read the rest

Peter & Ernesto: A Tale of Two Sloths

Peter & Ernesto have a good life: the two sloths sit in their Amazon treetop and make up songs about the animal shapes they see in the clouds. But one day, Ernesto gets it into his head to see the whole sky, from every place on Earth, and sets out through the jungle.

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