The 360 power rotation! In 2017 I reinvented the turning arrow, but it was without any power. Since then, other archers have performed tricks with the same powerless turning arrows. However, in... continue reading

posted by newtboy 4 months ago • 73 views • 1:13

YouTube description: In civil engineering, quicksand is more than just a puddle of mud! The "quick condition" occurs when seepage reduces the effective stress of a soil. This can lead to some dangerous... continue reading

posted by Aard Vark (oritteropo) 7 years 5 months 2 weeks ago • 1,490 views • 5:15

For many years, archery was part of warfare, but with the introduction of guns in the late Middle Ages and Renaissance, it started its long decline.. The "archery" of today is more like playing with... continue reading

posted by Mordhaus 7 years 5 months 3 weeks ago • 823 views • 5:06

This is probably the biggest loophole in German gun law: Because this arrow shooting airgun does not shoot a projetile THROUGH a barrel but OVER a barrel, the BKA (highest German authority on gun assessments)... continue reading

posted by Mordhaus 7 years 9 months ago • 333 views • 5:31

I built a water powered hammer called a “Monjolo”. I started by making a water spout from half a hollow log to direct water from the creek. This was set up in the creek and water flowed through it.... continue reading

posted by Joe Motion (lurgee) 7 years 10 months 2 weeks ago • 1,217 views • 8:51

Uhoh YouTube: Most systems and machines people design break from time to time. That also applies to the United States' nuclear weapons. This video was originally published in June 2015.

posted by PlayhousePals 8 years 2 months 2 weeks ago • 924 views • 3:50

This video is about why entropy gives rise to the arrow of time, and also how the initial low-entropy condition of the universe is responsible for the fact that we experience time right now, and how ultimately... continue reading

posted by Mekanikal 8 years 5 months 2 weeks ago • 42 views • 3:24

A 130lb bow with a very hard arrowhead shooting at a steel breastplate at twenty yards. Will it penetrate?

posted by Mordhaus 8 years 6 months ago • 534 views • 3:23

Fire-arrows - did archers really use them in battles?

posted by Mordhaus 8 years 6 months 1 week ago • 216 views • 11:28

Three hundred and sixty degrees, of seven hundred clowns, all in one small room. Use the arrows in the upper left to look around. Turn on CC for bonus information.

posted by newtboy 8 years 7 months ago • 16 views • 2:07

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 8 years 11 months 2 weeks ago • 622 views • 5:54

Watch these charismatic creatures shoot their tongues out like arrows to catch an insect, mimic leaves swaying in the wind, and display their hidden colors—and learn just how they do it. Click here... continue reading

posted by newtboy 9 years 6 months 4 weeks ago • 7,071 views • 3:39

I love the sound of breaking glass. YouTube: A special thank you to Dr. John Skinner, who is part of the Smarter Every Day Research team via Patreon for helping come up with the "tree explanation" of... continue reading

posted by PlayhousePals 9 years 9 months 2 weeks ago • 1,994 views • 8:51

Ancient Hun archery rapid fire technique demonstrated by Lajos Kassai

posted by newtboy 1 decade 1 month 2 weeks ago • 160 views • 4:04

Sean Carroll on the arrow of time.

posted by radx 1 decade 1 year 9 months 3 weeks ago • 536 views • 9:37