Red sprites, secondary jets and newly discovered green afterglow called "ghosts" triggered by red sprites. A dozen vibrant red sprites were recorded on this evening and only two events had the green afterglow.... continue reading

posted by newtboy 1 year 10 months ago • 979 views • 2:32

Would college students support a policy that would force those with high GPAs to donate part of their own GPA to help those with lower grades?

posted by bobknight33 3 years 1 month 3 weeks ago • 79 views • 4:45

YouTube description: Until the mid 1950’s, small short-range airliners like the twin engined IL-14 were really the only type the Soviet Union produced. And that meant flying across the country’s... continue reading

posted by Aard Vark (oritteropo) 3 years 4 months 4 weeks ago • 423 views • 10:05

At the old hut site (the new one being temporarily cut off by flooding) I made lime mortar from the shells of rainforest snails by firing them in a kiln, slaking them in water, mixing them into lime putty.... continue reading

posted by Mordhaus 4 years 2 months 3 weeks ago • 404 views • 7:08

I built a natural draft furnace to test ideas about how hot a furnace could get without the use of bellows. Natural draft is the flow of air through a furnace due to rising hot air. The hot gasses in the... continue reading

posted by Mordhaus 4 years 7 months ago • 453 views • 5:46

The Lahti L-39 is a Finnish 20 mm anti-tank rifle used during the Second World War. It had excellent accuracy, penetration and range, but its size made transportation difficult. It was nicknamed "Norsupyssy"... continue reading

posted by Mordhaus 5 years ago • 120 views • 10:14

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 5 years 10 months ago • 1,385 views • 4:32