search results matching tag: arrows
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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) 6 years 7 months ago • 1,490 views • 5:15For 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 6 years 7 months 1 week ago • 823 views • 5:06This 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 6 years 10 months 2 weeks ago • 333 views • 5:31I 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) 6 years 12 months ago • 1,216 views • 8:51Uhoh 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 7 years 4 months ago • 924 views • 3:50This 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 7 years 6 months 4 weeks ago • 42 views • 3:24A 130lb bow with a very hard arrowhead shooting at a steel breastplate at twenty yards. Will it penetrate?
posted by Mordhaus 7 years 7 months 2 weeks ago • 534 views • 3:23Fire-arrows - did archers really use them in battles?
posted by Mordhaus 7 years 7 months 3 weeks ago • 216 views • 11:28Three 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 7 years 8 months 2 weeks ago • 16 views • 2:07I 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 3 weeks ago • 621 views • 5:54Watch 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 8 years 8 months 2 weeks ago • 7,071 views • 3:39I 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 8 years 11 months ago • 1,993 views • 8:51Ancient Hun archery rapid fire technique demonstrated by Lajos Kassai
posted by newtboy 9 years 3 months ago • 160 views • 4:04Sean Carroll on the arrow of time.
posted by radx 1 decade 11 months 1 week ago • 535 views • 9:37- 1