2451
It's something temporary, but the Moon is 1/400th the size of the Sun & also 1/400th the distance from Earth which results in the Moon and the Sun being the same size in the sky, a coincidence not shared by any other known planet-moon combination [source: buff.ly/2xm2qDe]
2452
If you ever need to empty a bottle of its liquid (perhaps you’re cleaning the bottle) then there is a trick to do it quickly and it involves a whirlpool. This video demonstrates how
[source: buff.ly/3j4qT2L]
[explanation: buff.ly/2wYrX1x]
2453
26,000 years ago in the Czech Republic, one of our ice-age ancestors whose name is not even remotely remembered, selected a hunk of mammoth ivory and carved this enigmatic portrait of a woman - the oldest ever found [read more: ow.ly/L77G30n05qc]
2454
It's called visual hierarchy [read more: buff.ly/2RrbNGi]
2455
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]
2456
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]
2457
The southern cassowary has three-toed feet equipped with a lethal dagger-like claw up to 12 cm on the inner toe ow.ly/JusO30nm4e1. This photo by Sarah Davis shows a male southern cassowary's claws, possibly erasing any doubt that birds are dinosaurs buff.ly/2DCxsYg
2458
Sea wolves are genetically distinct from their inland cousin. Their diet consist of up to 90% seafood, 25% of which is fish. They are also great swimmers: the farthest record is to an archipelago 12 km from the nearest landmass [source, read more: buff.ly/3r037t9]
2459
Holoportation is the act of scanning in 3D to send a volumetric video anywhere in the world and in real time. Holoforge Interactive uses Azure cameras with depth sensors to give the feeling of real person presence [video: buff.ly/3JGX4nk]
2460
There's an endemic Mexican maize (Sierra Mixe) that has aerial roots using bacterial colonies to fix nitrogen from the atmosphere
[read more: buff.ly/3VI8dZU]
[📷 A. Van Deynze]
2461
This picture portrays Marie Curie and Albert Einstein strolling near a lake in 1929. Also a good reason to read the story of the letter Albert wrote to Marie and their friendship that many ignore [read more: buff.ly/3ouuw6v] [source of the photo: buff.ly/3quY9XY]
2462
Pandanus tectorius, also known as Hala fruit, has segmented, large fruits with a diameter of 4–20 cm and a length of 8–30 cm. The fruits are made up of 38–200 wedge-like phalanges, often referred to as keys or carpels
[read more: buff.ly/2MousBp]
2463
A zombie bug.
While it's not alive, it's not dead either. A large number of mind controlling fungi leads insects to assume the strangest behaviors in order to spread their spores and infect more insects to survive.
[read more: buff.ly/3Azbt26]
[📹 Ryan Andrews]
2464
Photographer Amos Nachoum captures amazing moments of the life in the oceans, like this leopard seal on the brink of eating a penguin, shot at Port Lockroy, Antarctica [source, read more: buff.ly/3qVCbuB]
2465
A flight landing in Munich just after sunrise with beautiful swirls, result of the plane’s wingtip vortices [2015 photo by Timo Harsch. Source, hi-res: bit.ly/2eVbB55]
2466
92 years ago #Today, the first photograph showing the curvature of the Earth was exhibited in Cleveland, Ohio
[read more: ow.ly/ajQe30n8x39]
2467
Tesla debuts an actual, mechanical prototype of its Optimus robot at AI Day 2022. It has 40 electromechanical actuators, a 2.3 kWh battery and could cost under $20,000 when built at volume
[more: buff.ly/3CoS5G4]
[watch: buff.ly/3yu7wuj]
2468
This clip (slowed down 8x) shows the motion of a helicopter's blade in a typical forward flight phase. You can notice the blade pitch change and the motion of the damper weights
[source, Chuck Aaron: buff.ly/3td6xJc]
[the Bell-Hiller mechanism: buff.ly/31L6W9f]
2469
The Pangeos is a concept created by Lazzarini Design for an itinerant floating city, comprising various hotels, shopping centers, parks, ship and aircraft ports, and all other facilities needed to house up to 60,000 guests
[📹 buff.ly/3Evwrzx]
2470
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]
2471
What would the worker need in order to escape the hole? Centripetal acceleration = v^2/r: increasing r means you have to increase v to compensate, so more velocity and a larger frictional force [read more: ow.ly/aNyY30n00jv]
2472
#Today in 1888, the Cliff Palace at Mesa Verde, Colorado, was rediscovered by rancher Richard Wetherill. In the 1200s, the Anasazi, an ancient pueblo people, built 150 rooms and 23 large, round kivas within a large rock shelter, high on a cliff buff.ly/3G15Axh
2473
The most common crystallization patterns of calcite are scalenohedra, with faces in the hexagonal {2 1 1} directions. You can find them of black color, justifying the informal definition of 'dragonscale' calcite [source of the clip, Rocks for the Spirit: buff.ly/3cat2IU]
2474
See how elephants actually help shape the flow of the Okavango River. Their constant movement leaves behind bigger and bigger highways in the reeds, creating a mosaic of paths right across. Landscape architecture on a grand scale [full video: buff.ly/35Ea74H]
2475
The SR-71 was the world's fastest and highest-flying operational manned aircraft throughout its career (1964-1998). In 1976, it set an absolute speed record of 1,905.81 knots (2,193.2 mph; 3,529.6 km/h), approximately Mach 3.3 [read more: buff.ly/2HMdnhM]
Astronomy, astronautics, meteorology, physics. Engineer, trying to build the big picture of #science via selected & curated pics, videos & links