2326
The Rhei clock uses a magnetic liquid called ferrofluid to tell time. At each minute, the clock's magnetic field is programmed to change, moving the liquid in its display [source, read more: buff.ly/2TAmUhT]
2327
Pāhoehoe is a basaltic lava that has a smooth, billowy, undulating, or ropy surface. These surface features are due to the movement of very fluid lava under a congealing surface crust [picture by Sparky Leigh, 2011: buff.ly/2XevSpG]
2328
Fire obsidian is an iridescent variety of obsidian. Its 'fire' is caused by thin layers of microcrystals of magnetite (which are approximately the thickness of a wavelength of light) [source, read more: buff.ly/2J0nQrl]
2329
50 years ago #Today, Apollo 17 launched the last men to have walked on the Moon, on the last Saturn V rocket to fly with a crew (so powerful you could even see shockwaves) bit.ly/2jp92Hv
2330
A samara is a winged achene, a type of fruit which enables the wind to carry the seed farther away from the tree than regular seeds would go. This is called anemochory
[read more: buff.ly/3JyHwS5]
[Shorea siamensis, clip by Tomoki SANDO]
2331
A crosswind landing is a landing maneuver in which a significant component of the prevailing wind is perpendicular to the runway center line. This is an A380
[read more: buff.ly/3VIi6Yb]
[📹 SDTV Live: buff.ly/3BkKqHC]
2332
If you own, manage or operate a livestock operation, counting your animals and monitoring the movement of your livestock is a critical part of your business. See how Vision AI can help improve the process [source , read more: buff.ly/3AgRDIB]
2333
Glass Plank Road in Tiantai Mountain, Zhejiang, China allows the close-up observation of a waterfall from from a glass-bottomed walkway.
[📹 Kuaishou Top-6182: buff.ly/3hsssfV]
2334
This is a rare color footage of the tallest person ever in recorded in history: Robert Wadlow stood 2.71 meters and weighed 223 kg. This home movie footage was taken during one of Wadlow's public appearances in the 1930s
[video: buff.ly/2JG9Dmq]
2335
With its colorful soils, salt caves and mountains, and ocher-stained streams and beaches, Iran’s Hormuz island is rich with memorable geology. Famous is its silver and glittering sand [read more: buff.ly/3m5rSUP] [source, Mohammad Davood Asadi: buff.ly/3juF9Vf]
2336
Mosquitoes do not feed on blood as their daily source of food.
Male mosquitoes only eat flower nectar, while female eat flower nectar, switching to blood when reproductively mature and in need of proteins to develop eggs.
[full paper: buff.ly/3qQtROl]
2337
El Rosario sanctuary near Ocampo, Michoacan, Mexico, hosts millions of Monarch Butterflies overwinter in conifer groves: a seasonal pause in one of the longest-known, multi-generational insect migrations on the planet buff.ly/3bTZoaE [source: buff.ly/3qj3ph3]
2338
This article was published on April 18, 1963.
The feature in the News-Journal, a newspaper out of Mansfield, Ohio tells us the concept of a cellphone existed long before you held one in your hand
[read more on Snopes.com: buff.ly/3wH1Olg]
2339
This is what the inside of a musical instrument looks like [source, read more: bit.ly/1F13nZW]
2340
This is a satellite view of Suloszowa, a village in Poland. Originally processed & posted by the Instragram account worldurbanplanning, it has spread on the internet because its captivating colors & geometry
[source: buff.ly/2YtLohj]
[read more: buff.ly/3gndMYH]
2341
One radian is the angle subtended at the center of a circle by an arc that is equal in length to the radius of the circle. Another way to see that is that a radian is an equilateral triangle, with one side curvilinear
[📹 @MathHappensOrg, read more: buff.ly/3iaG4au]
2342
Hippos can sleep underwater using a reflex that allows them to bob up, take a breath, and sink back down without waking up
[read more: buff.ly/2G658QW]
[📹 Vladyslav Vyazovskiy: buff.ly/2G64JxU]
2343
This photo by James St John [Flickr: buff.ly/3qtKlcH] shows the crown of Platycrinus saffordi, part of the Crawfordsville fauna of Indiana where it lived sometime during the upper Lower Carboniferous period, around 330.9 to 346.7 million years ago buff.ly/3ehPpOR
2344
A graphic tester like the Geekcreit GM328A can easily identify the components connected to the pins, detecting PNP, NPN bipolar transistors, resistors, capacitors and inductors
[video: buff.ly/3RCoez5]
2345
Jewel scarab beetles
They have an exoskeleton that contains intricate nano-structures that are responsible for their appearance
[read more: buff.ly/3BfQpwN]
[📹 Krzysztof Pach: buff.ly/3RZd736]
2346
This 1934 footage titled "Facts on friction" shows how Chevrolet brakes and in general how drum brakes work
[full video: buff.ly/3iqURi6]
2347
This is the piano that Steinway & Sons has unveiled when celebrated its 600,000th piece: 'The Fibonacci' features the iconic spiral and is made out of Macassar Ebony [read more: buff.ly/2EQ34XO]
2348
The making of a Penrose triangle by Hassan Abu-Izmero
[full video: buff.ly/3j4YIG3]
2349
European starlings are exceptional mimics, including human speech. Their ability at mimicry is so great that strangers have looked in vain for the human they think they have just heard speak buff.ly/37Mny47 Stella the starling is an example: buff.ly/2ATavSg
2350
See an entire apartment recreated one-to-one in VR
How Greg Madison turned every surface into interactive touchscreens for different apps
[video, HD: buff.ly/3QiHBMl]
Astronomy, astronautics, meteorology, physics. Engineer, trying to build the big picture of #science via selected & curated pics, videos & links