Vetulicolians are weird. First, they were thought to be an arthropod because of their segmentation, but due to the presence of gill slits and nothocord, Vetulicolians are now placed as stem chordates.... continue reading

posted by newtboy 4 weeks 1 day ago • 109 views • 2:01

YouTube description: On the river Rhine in Switzerland, there are reaction ferries: boats with no engine, no paddles, no onboard motive power at all. Here's how they work -- and a question about what... continue reading

posted by Aard Vark (oritteropo) 7 years 5 months 1 week ago • 601 views • 2:30

I invented the Bow Blower, a combination of the bow drill and forge blower to make a device that can force air into a fire while being easy to construct from commonly occurring natural materials using... continue reading

posted by Mordhaus 8 years 7 months 2 weeks ago • 1,388 views • 4:32