2451
This is a White-breasted Nuthatch. When it is confronted with an enemy (especially squirrels), including a rival nuthatch, it spreads its wings, then slowly rocks back & forth
[read more: buff.ly/3hOsKxN]
[📹 SJ 1st View: buff.ly/3PTs3Q7]
2452
The Balance Pteranodon has weights in the forward wing tips creating a center of mass below its beak and making a system that can rotate and oscillate about a stable equilibrium condition [source, read more: buff.ly/3riBxaR]
2453
50% of Panda births result in twins, but Panda moms almost always abandon one. Therefore, zookeepers have to switch the cubs every few hours to trick the mom in to caring for both
[source, full video, BBC: buff.ly/2N3GBvu]
2454
A blowhole is essential the nostril of a whale. Similar to a human's the whale’s blowhole is attached to their trachea and is connected to the lungs. In some whales' species, their appearance is definitely similar to a human nose, like this humpback whale ow.ly/e3iS30n5bbH
2455
These two mounds are in the Louisiana State University campus & they are structures older than the pyramids: one has been dated to be the among the oldest known human structures on earth. Yet they were used for tailgate parties until 2010
[read more: buff.ly/3UAlFOD]
2456
White, painted stripes on the body protect skin from insect bites, the first time researchers have successfully shown this effect. Among indigenous peoples who wear body-paint, the markings thus provide a certain protection against insect-borne diseases ow.ly/BzbK30nmkN9
2457
How researchers use drones to catch viruses blasted out of whale blowholes to overcome difficulties in sampling
[paper: buff.ly/2Ju0pcZ]
2458
A drone is probably the best tool to observe a controlled demolition [a silo in Aalborg Havnefront, Denmark, 2017. Full video: buff.ly/2ZHsMwf]
2459
In 2015, archaeologists in Scotland uncovered a 2000 year-old bolt that was fired from the so called Roman Manubalista, capable of launching a 17-cm, 120 km/h armor-piercing projectile with terrifying accuracy. This is a reconstruction [full video: buff.ly/318KCea]
2460
Kristy Paniptchuk filmed this clip in 2020 on an Alaskan river.
The fact the moose appears to walk on water (crossing the boat's path) is due to the shallow water and to the boat's jet motors
[read more: buff.ly/3QCOIiJ]
2461
We saw dust devils appear everywhere in clips posted in recent years (even on Mars) but this one is quite remarkable, even capable of forming in a room & through an open window
[read more: buff.ly/3BHlyYi]
[video: buff.ly/3FYsDGC]
2462
This video by Max Woolf and Janelle Shane shows how Google Cloud View interprets the famous duck-rabbit illusion, depending on its orientation
[code: buff.ly/3RdyFsp]
2463
This device made by Chinesec company Zhenjia allows an easy and intuitive visualization of a model created with interior design software, giving the customer a near VR perspective [find more: zhenjia.cn]
2464
This site drives you through 750 million year of Earth history and tracks your current location through geologic time: buff.ly/2sQ33QA
2465
Migratory birds are suffering the loss of their natural habitat & become critically endangered. The Cornell Lab of Ornithology works to help save them. This video by 422south.com explains the migratory patterns in the the Yellow Sea: buff.ly/3w64dqx
2466
Molokini is a crescent-shaped, partially submerged volcanic crater which forms a small, uninhabited islet located within Maui County in Hawaiʻi. It is the remains of one of the seven Pleistocene epoch volcanoes that formed the prehistoric Maui Nui island buff.ly/2ZuFTj7
2467
In the 1920s newly hired engineers at General Electric would be told, as a joke, to develop a frosted lightbulb. The experienced engineers believed this to be impossible: newly hired Marvin Pipkin got the assignment not realizing it was a joke & succeeded ow.ly/yRr730nXnkp
2468
This is known as the Morellet's Tiret Illusion, a modified painting where small circles seem to appear and disappear when your eyes move over them. Enlarge the picture and move your eyes around
[read more: buff.ly/2KCjXcq]
2469
When a very viscous liquid like honey is poured, a growing column of liquid coils begin to emerge from above the surface of the honey in an effect referred to as the liquid rope-coil effect. Here's a really detailed explanation of the phenomenon: buff.ly/34Lvgsh
2470
Stink bugs deposit their eggs on the underside of leaves in clusters with tight rows of individual barrel-shaped egg. Each egg is just 1 mm in diameter and some species' have a somewhat friendly appearance [video by Tim Doyle: buff.ly/3BoJe3r]
2471
Cohesion and adhesion are the stickiness that water molecules have for each other and for other substances. This is what we observe when we talk about surface tension [buff.ly/2JOB0sm]. This gif shows what happens when water stickiness is broken [buff.ly/3nmYnhR]
2472
Morpho peleides hatching, showing off its brilliant blue color, caused by the diffraction of the light from millions of tiny scales on its wings
[read more: buff.ly/2uHu49R]
[📹 Adrian Kozakiewicz: buff.ly/3HOJgIz]
2473
This is the stream table used at BYU's Department of Geological Sciences to model rivers and teach/research water dynamics and river conservation principles [full video by Cougar Cosmos: buff.ly/3DsRMYM] [Little River Research & Design: emriver.com]
2474
In 1st century BCE, Hero of Alexandria designed the first vending machine. When a coin was introduced via a slot on the top of the machine, a set amount of holy water was dispensed [read more: buff.ly/39phgcG] [video: buff.ly/2PdkPf4]
2475
Kaieteur Falls is the world's largest single drop waterfall. It is 226 metres (741 ft) high and has an average flow rate of 663 cubic metres per second (23,400 cubic feet per second
[📹 world.from.my.eyes: buff.ly/3wZY54M-]
Astronomy, astronautics, meteorology, physics. Engineer, trying to build the big picture of #science via selected & curated pics, videos & links