851
UV light is absorbed by the sodalite mineral, which then re-emits radiation at a longer wavelength – and it turns to a golden, lava-like color
[read more: buff.ly/3YVenbM]
[📹wild_nrocks: buff.ly/32zf6E1]
852
Icelandic black sand is found on beaches near a volcano and consists of tiny fragments of basalt
[read more: buff.ly/3wLzKhQ]
[📹 Lorenz Weisse: buff.ly/3wUa18q]
853
Don’t fall in
While hiking 30 miles in Iceland, John Derting showed how deep a seemingly shallow glacial body of water can seem.
[Instagram: buff.ly/32pWVTJ]
[TikTok: buff.ly/3nUWiK6]
854
Wood opal is a form of petrified wood which has developed an opalescent sheen or, more rarely, where the wood has been completely replaced by opal. Considerable deposits are in Queensland, Australia [read more: buff.ly/2INve8m]
855
A roaming herd of wild elephants was surprised by drone when sleeping
It happened on the outskirts of the city of Kunming in southwest China, before they resumed a year-long, 500-km trek
[read more: buff.ly/2UiSJkV-]
856
See the unseen and explore the world of vibration watching this drum cymbal in motion at 1,000 frames per second [source and full video by Fluke Corporation: buff.ly/2Fk4sqx]
857
Super agile and balanced, Direct Drive's Diablo is the world first wheeled-leg transformable robot powered by 6 direct-drive motors. An open development platform for custom controls & DIY [read more: diablo.directdrive.com]
858
Perfectly normal photo of Adele, isn't it? Just turn the picture upside down... [and learn about the Thatcher effect or why your brain can't properly process a photo of a face that is upside down: buff.ly/2DKqSMp]
859
Norwegian nature photographer Thomas Mørch knows how to get the perfect moment: this backlit bird's plumage captured while in flight is simply awesome [source: ow.ly/XlDr30ncdA6]
861
The Typhoon is a class of nuclear-powered ballistic missile submarines built by the Soviet Union. With a submerged displacement of 48,000 tonnes, the Typhoons are the largest submarines ever built. This picture gives an idea of their scale vs the crew buff.ly/2oNliRT
862
There are many ways to get across the point of distortion in the Mercator map. Here's a planisphere indicating a distance across Africa and another distance across Russia and things don't add up
[source, read more: buff.ly/3HGVLme]
863
Photographer Peter Maier captured this jaw-dropping timelapse of a cloudburst over Lake Millstatt in Carinthia, Austria
[source, full video, HD: buff.ly/2Mv5n7G]
864
According to recent researches, the world's deadliest animals for humankind are mosquitoes, preceding another deadliest class of animals, human themselves [read more: ow.ly/EcaU30ncY26]
865
Photographer Josh Anon captured the perfect moment in which the rising sun made this polar bear's backlit breath look like fire
[source: buff.ly/2FDooAk]
[author's site: joshanon.com]
866
The hallway illusion: cover the middle and you go faster, cover the sides to slow down
[explanation: buff.ly/2IrcrQA]
867
In this video, YouTube channel Robinson Foundry shows how they made a bolt with unique zigzag threads starting from a 3D printed model [full video: buff.ly/3neAWHB]
868
The Right Pointing Arrow spins 180 degrees and it still points to the right. Only in a mirror will it point left (and only to the left). Another incredible ambiguous object illusion by mathematician Kokichi Sugihara of Meiji University in Japan [more: buff.ly/2KonWcM]
869
The story of the shark, which, fitted with a GPS tracker, seemingly spent years drawing a picture … of itself
[read more: buff.ly/3Gerfmp]
870
In structural geology, a fold is a stack of originally planar surfaces, such as sedimentary strata, that have been bent or curved during a permanent deformation. The lower Ugab River valley of Namibia is an impressive example of such a process [read more: buff.ly/3f5Nugr]
871
Preikestolen (English: «Pulpit Rock'») is a tourist attraction in Rogaland county, Norway. Preikestolen is a steep cliff which rises 604 meters (1,982 ft) above the Lysefjorden
[read more: ow.ly/mPPE50ukEN3]
[📹 buff.ly/3iczpBX]
872
Considering pictures or long-distance views, you might have a somewhat static perception of an aurora. This real time video by Matthew Robinson give you a hint how dynamic and colorful are northern lights in the sky [source: buff.ly/2ZWniPO-]
873
Humpback whales create ‘bubble nets’ to snare their prey, sometimes with Fibonacci spiral patterns as showed in this clip by Richard Sidey. Researchers think the spiral patterns have advantages over circular ones
[full paper: buff.ly/3OdpN5f]
874
Aircraft pilots oxygen masks are fitted to the face using various suspension harnesses, but they generally use an inflatable harness for quick donning and to be put on in 5 seconds or less using only one hand
[📹 alyssathepilot: buff.ly/3H9Alkw]
875
33 days of wound healing time lapse
This popular clip by Kolo/Time Lapse reveals the surprising automatism of the human body healing process.
[source, HD: buff.ly/3QIOQO0]
Astronomy, astronautics, meteorology, physics. Engineer, trying to build the big picture of #science via selected & curated pics, videos & links