2451
Viscosity is the resistance to flow of a fluid. Motor oil viscosity grades are based on a scale using letters and numbers. This is practical way to compare engine oils
[read more: buff.ly/3uy3IWd]
[source: buff.ly/3Y1NRge]
2452
This isn't another steampunk project made by the Terminator fandom, but a real prosthetic hand from the Victorian era that can be found in London Science Museum’s collection
[full story and more pictures: buff.ly/33vU1b7]
2453
How high you would jump on other planets or moons?
This video shows the average jump height of a person on Earth and its equivalent in other worlds of the Solar System
[full video, HD, MetaBallStudios: buff.ly/3Jzo5sW]
2454
Douin artist zsx_6666666 draws anamorphic art on the road, obtaining impressive 3D effects
[📹 more videos: buff.ly/3P5X9nv]
2455
Located in northeast Iran at the foot of Mount Sahand, this kind of mound-like home is 700 years old & carved from volcanic rock. Being only partially underground they're inherently low-energy houses due to the internal favorable temperature
[read more: buff.ly/2DziRfA]
2456
Part of an overview of human history, this animation made with Blender shows how humans spread across the globe and their migration paths
[full video, History: In Context: buff.ly/3zEk5Cz]
2457
This clip shows hot to mechanically record and reproduce voice onto a wax cylinder, as performed by Thomas Edison in 1877
[📹 wyattssaab: buff.ly/3iMrKub]
2458
This is how Ethan Schlussler from Sandpoint, Idaho built his very own human powered elevator as a means to gain access to his recently constructed treehouse
[full video: buff.ly/2MCRlRx]
2459
This clip by MacroLab 3D compares an acupuncture needle (0.16 mm) with an insulin needle (0.3mm/30G) and a standard syringe needle (0.6mm/23G). A human hair knot is visualized for scale
[video, HD: buff.ly/3Af7VA4]
2460
A vapor cone is a visible cloud of condensed water which can sometimes form around an object moving at high speed through moist air, for example an aircraft flying at transonic speeds
[read more: buff.ly/2lkUJEo]
[📹 buff.ly/33HaFqR]
2461
This is when engineers taught robots to appropriately reject commands based on reasoning regarding action effects. The architecture controlled the robot in a simple natural language based interaction
[source: buff.ly/2qT5Hrd]
2462
The Canadair CL-415 (Superscooper, later Bombardier 415) is an amphibious aircraft based on the Canadair CL-215 and designed specifically for aerial firefighting
[read more: buff.ly/2ZTwJMb]
[source, full video: buff.ly/3ht7qbO]
2463
This is what Mount Fuji looks like from the International Space Station. The picture was captured by Expedition 2 on May 27, 2001 with a Kodak DCS460 Electronic Still Camera and an 800 mm focal length lens
[source: ow.ly/kh5w30o4nBS]
2464
To prevent drying out in the hot sun of the dry season, the giant monkey frog secretes a form of organic ‘sun screen’ and applies it to its body
[source, full video, BBC: buff.ly/2lhLK6Q]
2465
Axolotls are mostly silent creatures, but those who have heard them make noise describe the sound as either a squeak, a hiccup, or a high-pitched bark
[source 📹: buff.ly/3PcwUvn]
2466
Stare at the red dot on her nose for 30 seconds, then look at a plain wall while blinking fast and discover what is an afterimage
[read more: bit.ly/2FcSKeu]
[source: buff.ly/3AfcACk]
2467
This is the longest (theoretical) single uninterrupted train journey possible on Earth. Starting from the Portuguese coast, one can travel by train not just into China but all the way to southern Vietnam, a distance of 17,000 km (10,566 mi)
[read HERE: ow.ly/Nmnx50xqY28]
2468
NASA only uses 15 digits of π for calculating interplanetary travel. At 40 digits, you could calculate the circumference of a circle the size of the visible universe with an accuracy that'd fall off by less than the diameter of a single hydrogen atom ow.ly/rhmO30o4k7G
2469
Japanese multiplication
[how it woorks: buff.ly/3gRwcHx]
[📹 mathswithmisschang: buff.ly/3FwZTGb]
2470
This video shows how traditional Uzbek bread is made. The doughs are baked upside down, where the heat keeps them in place and the bakers know exactly when to grab them out of the oven before they fall off
[📹 Pure Life: buff.ly/3FMoN2i]
2471
Cephalopods' intelligence allow them to understand and solve even complex problems, like this not easy test of opening a jar from the inside
[read more: bit.ly/2gElV25]
[source: ow.ly/P4sG30o4Erz]
2472
Killer whales are notable for their complex societies only comparable to elephants & higher primates. Unlike any other mammal, killer whales live with their mothers for their entire lives & as they can reach age 90, as many as 4 generations travel together buff.ly/3vRtvYf
2473
When scientists put slime mold over a map of Tokyo, with food used to represent urban areas, and after a day the mold created a network nearly identical to Tokyo's rail network: all this without any brain
[read more: ow.ly/7CA730o4Sjk]
2474
The Fourier Transform explained in one sentence
[source and read more, by Stuart Riffle: buff.ly/3ILfsdD]
2475
When microbes decompose organic tissues below the water of polar lakes, methane is release and it's often trapped in bubbles under the surface of the ice. This is the result when you ignite it [source, learn more: buff.ly/2M6ycGv, buff.ly/2tlZEsj]
Astronomy, astronautics, meteorology, physics. Engineer, trying to build the big picture of #science via selected & curated pics, videos & links