1801
A pyramidion used to be the uppermost piece of an Egyptian pyramid or obelisk. It was generally made of diorite, granite, or fine limestone, then covered in gold or electrum. Very few pyramidia have survived into modern times. This is one of them [more: buff.ly/334VWDg]
1802
Huernia zebrina, the little owl, is a species of flowering plant in the family Apocynaceae, native to Africa. Its shiny, large flowers may look like plastic [photo by Reddit user u/7-methyltheophylline: buff.ly/3m9GsKH]
1803
In image processing, one of the elements you see in the clip is called a 'gabor'. Configurations of drifting gabors that are stationary, can give rise to dramatic global motion percepts. This is the 2016 winner of the Best Illusion of the Year contest: buff.ly/2QGIkxj
1804
Helium's the only element on Earth that is a completely nonrenewable resource. It can’t be artificially produced & is formed in natural gas wells as ancient uranium decays, which takes billions of years. That's why the world is constantly running out of it buff.ly/2CxkpWZ
1805
You may remember this tweet. My sister and I finally had a go for respectively donating and receiving a kidney. My transplant will be in October, either before mid-month or at the end of the month 1/🧵
twitter.com/Rainmaker1973/…
1806
The platypus localises its prey using almost 40,000 electroreceptors arranged in front-to-back stripes along its bill.
Bonus: this is sound it makes
[read more: buff.ly/2jqvqQb]
[📹 Platypus Conservation Initiative]
1807
Gannets can dive from a height of 30 m (100 ft), achieving speeds of 100 km/h (60 mph) as they strike the water
[read more: buff.ly/339A2UV]
[📹 Lisa Button, captured in 2020 in Newfoundland, Canada: buff.ly/33kzfAV]
1808
This animation using a domino analogy, shows why speed of sound is faster in solids, slower in liquids and slowest in gases
[📹 Higgsino physics library: buff.ly/3y9FqTs]
1809
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]
1810
Wave propagation in granular materials includes the possibility of emerging of localized solitary waves that propagate along one space direction only, with undeformed shape
[read more: buff.ly/3BZETWu]
[📹 rianki7: buff.ly/3SOcJEC]
1811
The Healesville Sanctuary, Victoria, Australia, is one of only two places to have successfully bred a platypus. The first platypus bred in captivity was born in the Sanctuary in 1943
[📹: buff.ly/3ftlvd0]
[read more: buff.ly/3CnLFqH]
1812
This time-lapse video by Max Olson shows what a 4.5 meter (15 feet) storm surge looks like. The video was recorded in Ft. Myers Beach, Florida during hurricane Ian landfall
[full video, HD, Max Olson Chasing: buff.ly/3RpovVc]
1813
The falling green characters at the beginning of all of the Matrix films have become perhaps the most recognisable visual from the film. So what constitutes the code? An incredibly complex equation? Nope, it's just a load of recipes for sushi [read more: buff.ly/2KxytCB]
1814
Constant-velocity joints (also known as homokinetic or CV joints) allow a drive shaft to transmit power through a variable angle, at constant rotational speed, without an appreciable increase in friction or play
[source, read more: buff.ly/2RqZr0W]
1815
When National Geographic launched a Pixar style 16′ x 16′ house 18′ tall with 300 8′ colored weather balloons and set a new world record for the largest balloon cluster flight ever attempted [read more: buff.ly/2FFHupt]
1816
This video created by British psychological professor Richard Wiseman demonstrates the power of perspective in creating illusions. It’s titled, “Assumptions”
[source, read more: buff.ly/2wbGWYY]
1817
Photographer Cassie Jensen captured this close encounter with a humpback whale in 2019.
[why whales (especially humpback whales) do breach: buff.ly/2AgRjwu]
[source: buff.ly/3oB0pLW]
[author's site: cassiejensenphotography.com]
1818
J58, the SR-71's secret powerhouse, has been called "black magic": an engine that can push a plane from 0 to Mach 3.2 without breaking a sweat. Here's how it works [video by TechLaboratories: buff.ly/2PySC23]
1819
The unique design of spider rice fields in Indonesia was created by the traditional way communal rice paddies were divided up among the indigenous people. In addition to being very peculiar views, sometimes they also provide interesting optical illusions buff.ly/3fpfbRE
1820
That time @StationCDRKelly dissolved an effervescent tablet in a floating ball of water on the International Space Station, and captured a video in 4K
[full hi-res video: ow.ly/ow0z30ntvrA]
1821
Costasiella kuroshimae (leaf sheep), is a sea slug performing 'kleptoplasty' = retaining the chloroplasts from the algae it eats, so that they can be used for photosynthesis [read more: buff.ly/2t9sPys] [📹️Catrin Pichler: buff.ly/3iASjgI]
1822
Iconaster longimanus, or icon star, has a very peculiar appearance: it's like a star inside a star and has marginal row of large plates that resemble mosaic tiles
[read more: buff.ly/2FHTE0W]
[photo credits: buff.ly/2FG6Gfz]
1823
Aviation Week’s Rupa Haria took this video of a wing-morphing “flexfoil” demonstrator. It illustrates how the airfoil shape could change in flight to boost performance over a wide range of angles of attack, indicated airspeeds and Mach levels [source: buff.ly/3w3QyzM]
1824
This baby zebra was born with spots instead of the species’ signature stripes. Wildlife photographer Abdelrahman Hassanein took a video of Tira, who has a genetic condition known as “pseudomelanism,” which causes abnormalities in zebra stripe patterns: buff.ly/2oP6S9M
1825
YouTuber MenzMade created this type of robotic arm that has two stages and four degrees of freedom, being entirely mechanical without any motor. It is actuated with wire rope and routed through bike cable in order to make the two stages independent: buff.ly/3m3QJqf
Astronomy, astronautics, meteorology, physics. Engineer, trying to build the big picture of #science via selected & curated pics, videos & links