676
Like the classic bottle with holes, the water can flow from the blue straw only if the air pressure is enough to push the water out, or when the red straw is above the blue one. When below, no air pressure on the blue one
[📹buff.ly/3P5YzhM]
677
How this machine, with the help of two people, easily replaces a railroad tie
[full video: buff.ly/2UApZPN]
678
This clip is a brilliant example of how play is totally shared by great apes and humans: not only gorillas and other primates play, but they do it just like us
[read more: buff.ly/3fI0vw1]
[📹 buff.ly/3Fy2i4n]
679
This video by Artur Homan shows a parasitic cuckoo chick at work. It'll throw the other eggs out of nest and the predisposed parental urge of the victim birds will ensure it'll have food and care
[source, full video: buff.ly/357GexV]
680
Just outside the city of Klevan in Ukraine, a nearly two-mile stretch of private railway has turned the surrounding trees into an enchanting natural tunnel. It's called the Tunnel of Love
[read more: buff.ly/2t29nEy]
681
Illustrator and anatomy instructor Chuan-Bin Chung encourages his students to understand the intricacies of the human body by drawing them. But his drawings are exact depictions of bones, muscles, and tendons—practically works of art in their own right ow.ly/dqNn50B7fR7
682
At Capilano park in Vancouver, BC, you can find a nice visualization of the effects of water erosion on rock, with a gradation of 15, 25 and 50 years
[read more: buff.ly/2wLamv5]
[📹: buff.ly/3rw9YvV]
683
In the 1920s-30s airship mooring masts were built in many countries. Without doubt the tallest mooring mast ever designed was the spire of the Empire State Building. The top pic shows British M.P.s walk onto an airship gangplank, in Cardington, England buff.ly/2Qo8otD
684
This is a satellite view of Suloszowa, a village in Poland. Originally processed & posted by the Instragram account worldurbanplanning, it has spread on the internet because its captivating colors & geometry
[source: buff.ly/2YtLohj]
[read more: buff.ly/3gndMYH]
685
In the 1990s an oil exploration company dredged up brine shrimps larvae while drilling near the Great Salt Lake & when the the crew placed them in water, some of them hatched. Radiocarbon dating estimated they had been lying there for 10,000 years [more: buff.ly/1PrFfbq]
686
This mini-tug was built by Chuck’s Boat and Drive out of Longview Washington and used by the U.S. Navy to move ships and submarines. It's the smallest active-duty vessel of the United States Navy
[source, read more: buff.ly/3jaB0TS]
687
The brown hyena (Hyaena brunnea), also called strandwolf, is a species of hyena found in Namibia, Botswana, western and southern Zimbabwe, southern Mozambique and South Africa. It is currently the rarest species of hyena [read more: ow.ly/Y57Q50xnvwL]
688
Lithops are Namibian and South African plants that have evolved to look like stones
[read more: bit.ly/2gLSyHy]
689
Just Room Enough Island lies on the Saint Lawrence River between Heart Island and Imperial Isle, close to the US border with Canada. It is known for being the smallest inhabited island, which appears to be around 3,300 square feet (310 m²)
[read more: buff.ly/3FaiE1E]
690
Called the pioneer of the Perceptual Art movement, artist and sculptor Michael Murphy works with anamorphosis. This is one of his most famous works, "The Immigrant"
perceptualart.com
691
This collection of non-circular gears and cam-follower systems has here a purely aesthetic function that reflects the beauyt of motion and syncronism
[source: buff.ly/2r24kGt]
692
What is the theoretical longest (vertical) straw you could possibly drink from? It's one where the pressure at the top of the straw is 0.
If P = atmospheric pressure and ϱ the density of water
h=P/(ϱ•g)
h=101kPa/(9.81•1000) = 10.3 m
[read more: buff.ly/3aMdjyd]
693
50 years ago #Today, the crew of Apollo 17 took the iconic "Blue Marble" photo. The last time human eyes saw this amazing view from a spacecraft go.nasa.gov/2joIFBx
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50 years ago #Today, Apollo 17 launched the last men to have walked on the Moon, on the last Saturn V rocket to fly with a crew (so powerful you could even see shockwaves) bit.ly/2jp92Hv
695
The popular Pythagorean theorem water demo visualizes the equation
a² + b² = c²
using water. The two smaller squares of water pour perfectly and equally into the area of the larger square on the longer side
[full video: buff.ly/2Ei7Rqg]
696
This is from The Tonight Show with Johnny Carson aired on May 20th, 1977.
Carl Sagan says something very important, a strong message that didn't lose any validity since then.
[full interview: buff.ly/3h2ufYP]
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In 1862 Charles Darwin received a flower from Madagascar with the nectar located in an extremely deep crevasse. He predicted the existence of a moth with an extraordinarily long tongue to reach the nectar. Xanthopan morganii was discovered 150 years later ow.ly/3hmm50B6Brz
698
Alces alces, known as moose in North America & elk in other regions of the world, can reach a height of 2.3 m (7ft 6") from hoof to shoulder (i.e. head & antlers are not in the count)
[read more: buff.ly/2WHrz4R]
[📹 buff.ly/3XZ05pP]
699
These two mounds are in the Louisiana State University campus & they are structures older than the pyramids: one has been dated to be the among the oldest known human structures on earth. Yet they were used for tailgate parties until 2010
[read more: buff.ly/3UAlFOD]
700
The Line is a smart city in Saudi Arabia that will have no cars, no streets, and no carbon emissions. When completed, it will be 170 km across, will preserve 95% of the nature within Neom & is planned to have 1 million residents: buff.ly/3Id2AMC
Astronomy, astronautics, meteorology, physics. Engineer, trying to build the big picture of #science via selected & curated pics, videos & links