In this video, Tim demonstrates a variety of Lenz's Law demonstrations. At its simplest, you can just drop a magnet down a metal tube, maybe made of copper or aluminium, and be surprised at how slowly... continue reading

posted by Mordhaus 1 year 5 months 4 weeks ago • 965 views • 6:01

YouTube description: In Göttingen, Germany, there's a four-tonne steel ball that can be raised up a 14-metre tower -- and then dropped in less than two seconds, crashing back to earth. It makes tiny,... continue reading

posted by Aard Vark (oritteropo) 2 years ago • 723 views • 3:34

The landscape of Iceland has changed a lot in a thousand years. When the Vikings first arrived in the ninth century, the land was covered in 25 to 40 percent forest. Within a few centuries, almost all... continue reading

posted by newtboy 2 years 1 month ago • 797 views • 5:22

I made a brick mold that makes bricks 25 x 12.5 x 7.5 cm from wood. A log was split and mortise and tenon joints were carved using a stone chisel and sharp rocks. The mold was lashed together with cane... continue reading

posted by Mordhaus 2 years 4 months 4 weeks ago • 1,014 views • 10:47

YouTube: I came across these four physics puzzles over the years in discussions with Neil deGrasse Tyson (riddle 4: which part(s) of a moving train are going backwards with respect to the ground?), Simon... continue reading

posted by PlayhousePals 2 years 10 months 1 week ago • 1,212 views • 4:24

I never thought of sand as a non-renewable resource, but there's only a limited supply: and to make things worse, it keeps getting washed into the sea. At Cape May, New Jersey, the US Army Corps of Engineers... continue reading

posted by Mordhaus 3 years ago • 1,739 views • 3:22

"This animation starts with an overview of North America, Central America, and the Caribbean. As the camera slowly pushes in, Hurricane Matthew begins to form. By the morning of October 2nd, 2016 Matthew... continue reading

posted by Warren E. Hale (MrFisk) 3 years 4 months 2 weeks ago • 8 views • 1:29

Practice! YouTube: If most people got on a skateboard, they would roll forward slowly for a few feet, then fall down and break their wrists. But there are a proud few who can do some pretty amazing... continue reading

posted by PlayhousePals 3 years 5 months 3 weeks ago • 9 views • 3:11

With all of the global warming a new threat has emerged, the release of methane gas, trapped in methane hydrates on ocean floors. It's release is often referred to as the 'methane bomb'. The last time... continue reading

posted by Mordhaus 3 years 6 months 3 weeks ago • 965 views • 8:37

UAlberta: UAlberta research team uses MRI video to observe for the first time what happens inside joints when they crack. (Edmonton) “Pull my finger,” a phrase embraced by school-aged kids and embarrassing... continue reading

posted by Zawash 4 years 10 months 1 week ago • 405 views • 7 secs

YouTube Description: Is your lack of sleep slowly killing you?

posted by PlayhousePals 6 years 4 months 4 weeks ago • 236 views • 3:01

(Description via YouTube) Everyone has played with a mixture of corn starch and water (or at least I hope they have). This was one of my favorite experiments as a kid. Your hand slides into the slime... continue reading