801
What happens if you roll a circle inside a circle that’s 4, 3 and 2 times as big? You get an astroid, a deltoid and... A straight line! [read more: bit.ly/2pkEhs1]
802
Strong explosions accompanied by volcanic lightning were registered at Sakurajima volcano, Japan at 10:30 UTC on December 3, 2022, suring a new eruption that sent volcanic ash at 1.8 km (6 000 feet) above sea level.
[read more: buff.ly/3utUavz]
803
The Komondor, also known as the Hungarian sheepdog or 'mop dog', is a large, white-coloured Hungarian breed of livestock guardian dog with a long, corded coat [read more: buff.ly/2HEAONm]
804
It never gets old. When a helicopter's propeller is perfectly synced with the camera frame rate, the result is always astounding
[why it happens: buff.ly/34ZNsl5]
twitter.com/ScienceGuys_/s…
805
The Great Pyramid of Giza used to look very different from the way it does now. When it was first completed, its external walls of limestone were sanded smooth to shine bright white and it had a golden cap
[video: buff.ly/2A9060G]
[read more: buff.ly/334VWDg]
806
Kaketsugi – literally ‘invisible mending’ in Japanese – is an amazing cloth mending technique from Japan that involves repairing damaged cloth to the point where you can’t even tell it was ever damaged.
[source, read more: buff.ly/3snCeBT]
807
A typical Walmart supercenter has a 5-acre parking lot, and it’s a wasteland, especially if you have to sweat your way across it under an asphalt-bubbling sun. Put a canopy over it, though, and it could support a 3-megawatt solar array [read more: buff.ly/3r7aeTD]
808
This small carving of a water bird was created 33,000 years ago. Sculpted in mammoth ivory, it was found in the Hohle Fels cave in Germany in 2002 and it's the earliest known representation of a bird
[source, read more: buff.ly/2Nmeo3A]
809
This documentary from PBS shows an octopus changing colors while sleeping. Marine biologist David Scheel thinks that the sea creature is dreaming about hunting, which sparks the color shift to a camouflaged shade [video: buff.ly/2lqQuuL]
810
Salar de Uyuni is the world's largest salt flat. Following rain, a thin layer of dead calm water transforms the flat into the world's largest mirror, 129 km across
[read more: buff.ly/37Ugxma]
811
There is an inland island in Canada that is larger in area than the lake in which it is situated
[read more: bit.ly/2zBqpLJ]
812
Wildebeest are very strong and can inflict considerable injury even to a lion, especially jumping when running at maximum speed of up to 80 km/h (50 mph)
[read more: buff.ly/3qlwJma]
[📹 Lauren Hughey: buff.ly/3AZDEpI]
813
This is what you see when you look out from the International Space Station (and using a telelens)
[source, @OlegMKS: buff.ly/3QTyFhi]
814
Descension by Anish Kapoor depicts fluidity through water’s continuous swirling motion as it rushes down an 8 m (26 ft) diameter vortex representing a powerful physical form that is sucked into the earth
[read more: buff.ly/3zewTiQ]
815
This animation by the @TheOceanCleanup shows a vision of a future in which the Great Pacific Garbage Patch (3 times the size of France & containing up to 100,000,000 kg of plastic waste) is consigned to history books [full video: buff.ly/3qSSQ3s]
816
Canadian camouflage company Hyperstealth Biotechnology has applied for four patents related to their Quantum Stealth or “invisibility cloak” prototype material. The video at the company's site show the technology in a variety of viewing conditions: hyperstealth.com
817
This see-through sea cucumber is so transparent that you can even see its digestive tract winding through its body. It has been spotted at a depth of 3,175 meters (2 miles) near the base of submarine volcano in Indonesian waters buff.ly/3C558w2
818
It's not easy to safely film a polar bear. This is how Gordon Buchanan came face to face with a huge wild polar bear quite keen to get to what smells like a tasty meal
[full video, BBC: buff.ly/3fPbWVR]
819
It might not be a fully reliable source, but according to worldometers.info, the world population has just surpassed 8 billion people today
worldometers.info/world-populati…
820
The Kamenstein World of Motion Rocket Teapot Kettle is a quite rare object: made of polished stainless steel, the kettle has two steam-driven rocket which move around the pot when the water boils
[read more: buff.ly/3sGGtYW]
[📹: buff.ly/3sM4kXf]
821
Believe it or not, thousands of hedgehogs come through the doors of veterinary clinics every year, and around two thirds of them will require an X-ray. This is how it's generally performed
[read more: buff.ly/3SqdKm3]
[📷 Dr. Longissimus]
822
The Mwanza flat-headed rock agama also known as the Spider-Man agama, can't spin webs but can climb up vertical walls with ease [read more: buff.ly/2IHa1jT]
823
This video by traditional carpenter Dylan Iwakuni shows some of the fascinating traditional joineries discovered while taking apart this 100 year old Japanese house, literally built without using a single nail [full video, HD: buff.ly/3A3pN2W]
824
Lawrence Livermore National Laboratory scientists report they have managed to create an artificial fusion reaction that produced more energy than it took to create. Formal announcement will follow tomorrow.
[read more: on.ft.com/3PgDdya]
825
Where does water really fall into? Great demonstration of rotational forces at work.
[📹 buff.ly/3jls5nX]
Astronomy, astronautics, meteorology, physics. Engineer, trying to build the big picture of #science via selected & curated pics, videos & links