776
In the earliest days of space exploration, most calculations for early space missions were done by “human computers” and most of these computers were women. This photo from 1953 shows the team behind the launch of U.S. first satellite, Explorer 1 [source: buff.ly/3CFJzPX]
777
This photographic comparison shows the Anak Krakatau volcano, before and after the explosion which caused the deadly tsunami on December 22, 2018 [source: ow.ly/zUru30nhrqW]
778
The laughing kookaburra is known as the “bushman’s alarm clock” because it has a very loud call, usually performed by a family group at dawn and dusk, that sounds like a variety of trills, chortles, belly laughs, and hoots [source: buff.ly/3qQ25CU-]
779
In this video, YouTube's Brick Experiment Channel tests a Lego car against different obstacles and improving it until it becomes a capable climber [full video, HD: buff.ly/3x0U3rz-]
780
HiP-CT is a new technique that can hierarchically image whole human organs, beginning with the resolution of a human hair (25μm/voxel) down to a resolution where we can see single cells (1.5μm/voxel) [full video by Paul Tafforeau: buff.ly/3x3QwJo-]
781
These odd-looking bugs were spotted in 2017 by Mandy Trichell in Texas. They are likely Homaemus proteus and show a curious and interesting colelctive behavior
[source, Storyful: buff.ly/3BhtUc1]
[more info: buff.ly/3AQtDv1]
782
This clip visualizes the impact of load distribution on trailers at different speeds. Avoiding towing mistakes can prevent accidents
[read more: bit.ly/2DVKHlE]
[📹 Supercar Blondie]
783
These excerpts from a 1980 documentary about Czech animator Karel Zeman show how some of Karel’s special effects were achieved in the movies he made between 1947-1980
[full video + read more: buff.ly/3LAKWnn]
784
Kaieteur Falls is the world's largest single drop waterfall. It is 226 metres (741 ft) high and has an average flow rate of 663 cubic metres per second (23,400 cubic feet per second
[📹 world.from.my.eyes: buff.ly/3wZY54M-]
785
The Serpent d'Océan is a metal sculpture located on the Saint-Brevin-les-Pins beach, France. This permanent installation by artist Huang Yong Ping represents the skeleton of a huge prehistoric snake that is somewhat playful with the tides [read more: buff.ly/3wxJpc2]
786
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-]
787
Cork harvesting is done entirely without machinery without inflicting permanent damage to the tree. A cork oak can be harvested from five to seventeen times in total
[read more: buff.ly/3BgZh6h-]
[📹: buff.ly/3KOCjGW-]
788
The green vine snake is viviparous, giving birth to young that grow within the body of the mother, enclosed within the egg membrane. This is a handful of green vine snakes
[📹Christopher Dickey: buff.ly/3TQP9Zh]
789
Rubbing a sharpie on a can, close to the tear strip, leads to the can to open. Rubbing causes the alluminum to flex back and forth and therefore to get weaker. Eventually the metal can't hold the pressure anymore and pops [full video by the Physics Girl: buff.ly/2NjWm39]
790
You can pop a balloon with an orange: the limonene in the orange peels dissolves or weakens the rubber balloon [read more: ow.ly/IMhK30ngcc2] [full video, Home Science: bit.ly/2tOhU0f]
791
This photo by James St John [Flickr: buff.ly/3qtKlcH] shows the crown of Platycrinus saffordi, part of the Crawfordsville fauna of Indiana where it lived sometime during the upper Lower Carboniferous period, around 330.9 to 346.7 million years ago buff.ly/3ehPpOR
792
What actually happens underground at a gas station? This video by Franklin Fueling explains all the technical details you normally ignore during a refueling stop [source, full video by FranklinFueling: buff.ly/2AMbbJi]
793
The atmosphere of Mars vs Earth
[source: buff.ly/3Bkkj4f]
[image processed by @thomas_appere: flic.kr/p/2izuvpP]
794
Cohesion and adhesion are the stickiness that water molecules have for each other and for other substances. This is what we observe when we talk about surface tension [buff.ly/2JOB0sm]. This gif shows what happens when water stickiness is broken [buff.ly/3nmYnhR]
795
Despite the common conception that Richard Feynman knew everything automatically, he needed to work hard to teach himself calculus, since his high school, as many others in 1930s, did not offer courses. This is the story of his notebooks: ow.ly/MkFt30nfdI9
796
This gearbased joint by ABENICS drives three rotational degrees of freedom without slippage
[full paper: buff.ly/3gG96AH]
[media: buff.ly/3gMZ67y]
797
The reticulated python is among the three heaviest snakes.
This is how the it climbs a tree.
[read more: buff.ly/3RKCt4z]
[source, sped up video: buff.ly/3U19njp]
798
The spider-tailed horned viper is a superb mimic. Its tail resembles a spider and it's used as a lure to attract insectivorous birds to within striking range.
[read more: buff.ly/3qi6FrS]
[📹 BB Earth]
799
Flamingos aside, you do not get to see the color pink in the animal kingdom a great deal. A notable exception is the pink katydid. Similar to and rare like albinism, erythrism is a condition that causes a curious reddish pigmentation in animals buff.ly/2GHXGMc
800
The world's first astronomical site, Nabta Playa, was built in Africa and is 2,000 years older than Stonehenge. Located in the Sahara desert, the 7,000-year-old stone circle was used to track the summer solstice and the arrival of the annual monsoon season buff.ly/2AMeIY4
Astronomy, astronautics, meteorology, physics. Engineer, trying to build the big picture of #science via selected & curated pics, videos & links