1851
The Spinning Dancer is a kinetic, bistable optical illusion resembling a pirouetting female dancer. Some observers initially see the figure as spinning clockwise & some counterclockwise. Some can see it change rotation direction suddenly
[read more: buff.ly/2KM24au]
1852
Manganese Nodules are found at the bottom of the ocean and they contain all the components needed for electric car batteries. Its estimated there are enough nodules to create over 200 million batteries and their worth is estimated up to 16 trillion dollars ow.ly/7DZH50xdzFJ
1853
Watch the rise of human cities, beginning with [arguably] the world’s first city in 3700 BC and continuing up to the present
[full version with slider + read more at metrocosm.com: buff.ly/3gsWRGm]
1854
Just to let you know, this account on Mastodon is not me: it's an impersonator. Thanks.
1855
In the Socorro Islands, the change of seasons is marked by a swirling vortex of bubbles caused by a collision of cold and warm deep water currents. See how the local pufferfish was caught by surprise by the vortex [source: buff.ly/3s1Sky9]
1856
Less than 200 vessels (across all sizes) suffer from marine accidents and capsize every year out of 80,000+ in total. Ships survive storms thanks to several measures
[read more: buff.ly/3fobhYn]
[📹 buff.ly/3WdU4UN]
1857
This is the peculiar effect you obtain when you blow up a balloon, cover it with glue, let the glue dry and then pop the balloon
[source, antonxmi: buff.ly/3Vt1EdZ]
1858
This visualization by @nealagarwal shows the scale of the cosmos, from an astronaut to the observable universe.
Visit: neal.fun/size-of-space/-
1859
In this 1964 episode of the ABC’s classic science program, ‘Why Is It So?’, Professor Julius Sumner Miller re-attempts a favourite experiment, and things don’t quite go to plan. But then, his pure joy as experiment takes unexpected turn
[full video: buff.ly/3yywZRv]
1860
It looks like a little hippopotamus that can change its colour... A hypnopotamus? It's a Metasepia pfefferi, or Pfeffer's flamboyant cuttlefish, one of the most intriguing species of cephalopods
[source, Aquarium of the Pacific: buff.ly/2Jn8wbh]
1861
Over the last 200 years, Earth's magnetic field, which is vital to life on our planet, has lost around 9% of its strength on a global average. A large region of reduced magnetic intensity has developed between Africa and South America [full story: buff.ly/2LP4jwo]
1862
Brittle stars move fairly rapidly by wriggling their arms which are highly flexible and enable the animals to make either snake-like or rowing movements
[📹 D. Allan Drummond]
[read more: buff.ly/3FjzYBt]
1863
The story of the Chinese students protesting with printouts of the Friedman equation – which governs the expansion of the universe – because the pronunciation: is similar to "free的man" (free man)
[read more: buff.ly/3VptOqg]
1864
Crows like to pull tails. Some researchers think it is to distract another animal from eating allowing either the crow itself or an accomplice to snatch the food away, while others think they do it just for fun
[read more: buff.ly/2KGuvHr]
1865
The story of Masako Wakamiya, the woman who became the oldest app developer at 84 years old, from when she got her first computer in 1997 to her first app developed when she was 82
[video story: buff.ly/3VALMXA]
1866
Miners carbide lamps were powered by the reaction of calcium carbide (CaC₂) with water (H₂O). This reaction produces acetylene gas (C₂H₂) which burns a clean, white flame
[read more: buff.ly/3prOhwd]
[📹 Jesse Marosek: buff.ly/3dCxunM]
1867
Artist Jonty Hurwitz creates amazing anamorphic sculptures that can only be seen in their own reflections [source, more artworks: buff.ly/2GiWbju] [more about anamorphosis: buff.ly/2GjoPko]
1868
The olm or proteus (Proteus anguinus) is an aquatic salamander in the family Proteidae. The olm's eyes are undeveloped, leaving it blind. It has been estimated that they have a maximum lifespan of over 100 years [read more: buff.ly/2VWhBeV]
1869
Here's how deep humans have dug underground in the past 100 years
[video: buff.ly/2GT4uSI]
1870
A famous physics puzzle: why does the hourglass not start rising right away?
[source: buff.ly/2mSOj3E]
If you want to know the answer, you may visit this site, that has some different plausible answers: buff.ly/2EOKxeA
1871
Imagine being inside a painting by Van Gogh. This 3D video by 幻维数码 Motion Magic is designed to make you experience in 360° the famous Starry Night by the dutch artist
[full video: buff.ly/3fMcaJL]
1872
One of the most realistic, highest-resolution 3D simulation of star formation to date developed by Northwestern University. STARFORGE simulates an entire gas cloud where stars are born
[video by Mike Grudić: buff.ly/3f11JTp]
1873
This lenticular post card simulates the prop from “Back to the Future" and it was created for the 35th anniversary of the movie [source, read more: buff.ly/3xl69x7]
1874
Photographer Yves Villa captured this unusually heart-shaped lightning in Provence, France, on July 31, 2016
[source, more photos: buff.ly/3EO5DfK]
1875
The weedy seadragon (Phyllopteryx taeniolatus) has small leaf-like appendages that resemble kelp fronds providing camouflage and a number of short spines for protection, plus an often iridescent body
[📹 Harry Cassio: buff.ly/3qr7IWA]
Astronomy, astronautics, meteorology, physics. Engineer, trying to build the big picture of #science via selected & curated pics, videos & links