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 3 months ago • 895 views • 2:32

After being exposed to the virus that causes COVID-19, it can take as few as two and as many as 14 days for symptoms to develop. Cases range from mild to critical. The average timeline from the first symptom... continue reading

posted by eric3579 7 months 1 week ago • 503 views • 5:19

"Behavior of mice aboard the International Space Station 20 female mice were transported to the International Space Station by SpaceX CRS-4 Dragon spacecraft. On NASA’s Rodent Habitat, the mice engaged... continue reading

posted by ant 1 year 6 months 2 weeks ago • 12 views • 3:42

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) 1 year 10 months ago • 419 views • 10:05

YouTube description: Let's find out how they put 3D images into glass objects. Known as a 'Bubblegram', vitrography or sub-surface laser engraving, this technology has been around for a very long time... continue reading

posted by Aard Vark (oritteropo) 2 years 6 months 2 weeks ago • 307 views • 6:28

YouTube description: Real indigo-dyed clothing is not like the blue you know. Richer than the chemical blues used on most fabrics today, real indigo dye comes from a plant and has a surprising range... continue reading

posted by Aard Vark (oritteropo) 2 years 9 months 4 weeks ago • 1,381 views • 3:05

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 3 years 5 months 1 week ago • 100 views • 10:14

How we went from requiring 3 or more engines to cross the ocean to allowing twin engine planes to cross, and the increase in reliability, and ETOPS range of modern twin engine planes.

posted by RFlagg 3 years 5 months 3 weeks ago • 1,238 views • 8:57

Is it the be all and end all?

posted by PlayhousePals 4 years 2 weeks ago • 226 views • 4:26

"I might casually say: 'you're crazy'." YouTube: Comedian Jim Gaffigan urges us not to be dismissive. Talk to people who are different from you. Widen your friendship circle, watch a wide range of news... continue reading

posted by PlayhousePals 4 years 2 weeks ago • 936 views • 5:41

I counted a bunch, but I'm sure I missed plenty. ... I'm Daniel Shiffman, In this YouTube channel I publish "creative coding" video tutorials every week. I also answer questions during live streams! ... continue reading

posted by notarobot 4 years 1 month ago • 24 views • 1:38

From YT- The issue of mobility in armour is addressed there with striking images of actual armour pieces to demonstrate the range of movement allowed when worn. Today, our contribution follows the same... continue reading

posted by SDGundamX 4 years 3 months 4 weeks ago • 277 views • 3:36

I made this bow and arrow using only primitive tools and materials.The bow is 1.25 m (55 inches) long and shoots 60 cm (2 feet) long arrows. I don't know the draw weight - safe to say greater than 15 kg... continue reading

posted by Mordhaus 4 years 7 months ago • 617 views • 5:54

The fascinating video above tells the story of MIT Professor Ioannis Yannas, who was recently inducted into the National Inventor’s Hall of Fame alongside such luminaries as the Wright brothers and Steve... continue reading

posted by enoch 4 years 9 months 1 week ago • 1,837 views • 16:57

Sacks of Water, prepare to have your minds blown. From YouTube: "Does water have a fourth phase, beyond solid, liquid and vapor? University of Washington Bioengineering Professor Gerald Pollack... continue reading

posted by chicchorea 4 years 10 months 1 week ago • 1,027 views • 24:15

In this video you are going to learn about some amazing dolphin facts that are mentioned step by step. Please subscribe to our channel for more updates. Subscribe here http://bit.ly/1HVj6gh Visit... continue reading

posted by abubakker21 5 years 2 months 4 weeks ago • 23 views • 3:33

Abstract: Hydrographic printing is a well-known technique in industry for transferring color inks on a thin film to the surface of a manufactured 3D object. It enables high-quality coloring of object... continue reading

posted by newtboy 5 years 5 months 3 weeks ago • 881 views • 4:55