901
Wild mammal biomass has declined by 85% since the rise of humans. Today, humans represent aproximately 34% of global mammal biomass, while 62% is humans' livestock and pets. Wild mammals are just 4%
[read more: ourworldindata.org/mammals]
902
Tools like the Court Line Tape Machine guarantee perfect lines and crisp edges in basketball and indoor sport courts. This is an example of how lines are made
[source, full video: buff.ly/3aY4KRU]
903
Professor Chris Bishop demonstrates the reaction of phosphorus burning in pure oxygen, which also explains why the name phosphorus means "bearer of light"
[full video with more reactions: buff.ly/2KNlrCQ]
904
If you put a series of out of phase metronomes on a movable surface, they will sinchronize themselves according to what is called a Kuramoto model of synchronization
[explanation: bit.ly/2qwVE9N]
[IkeguchiLab: buff.ly/2MjPcKG]
[more: buff.ly/2sYxvr3]
905
The functioning guitar the size of a human blood cell (with six strings each about 50 nanometers, or 100 atoms, wide) that the Cornell University scientists created in 1997
[read more: buff.ly/2sWwK1A]
906
That's why science education is important
[full story: buff.ly/2LGPXfJ]
907
In agriculture, a terrace is a piece of sloped plane that has been cut into a series of successively receding flat surfaces or platforms, which resemble steps. It prevents erosion, benefiting the ecosystem while providing a livelihood for farmers buff.ly/2JL7h5H
908
Animated historic land changes of Europe for every decade: it's actually greener than 100 years ago
[source, read more: bit.ly/2yMoE0P]
909
This is a 200 kilogram preserved blue whale heart
[source, read more: buff.ly/3VDvmNk]
910
When you lay bricks like dominoes at the proper distance, on top of the obvious domino effect, you get an unexpected opposite wave starting as soon as the last bricks falls down
[Learn why bit.ly/2Gm4sCJ]
[📹 Satisfrying: buff.ly/3OLUVcG]
911
Sociable weavers construct permanent nests on trees and other tall objects. These nests are the largest built by any bird, and are large enough to house over a hundred pairs of birds, containing several generations at a time
[read more: ow.ly/MU7730nXbBc]
912
The borosilicate glass and the oil have roughly the same index of refraction, so this clear beaker has no markings and bends light to the same degree as cooking oil
[source, read more: buff.ly/3FiogFf]
913
3D printing is a recent but promising technology available to professional prosthetists and amateurs alike. So anyone with access to a 3D printer and a DIY mentality can create a bespoke prosthesis at a low price point. Like this prototype by William Root buff.ly/3ucW6qh
914
Have you heard about the Hubble Ultra-Deep Field? Either way, you've likely not heard about it like this. At the link you can run your pointer over the featured image and listen: pointing to a galaxy will play a note that indicates its approximate redshift buff.ly/2FWD7s0
915
50 years ago #Today, one of the earliest arcade video games, #Pong, was originally released by Atari bit.ly/1JQZDlB
916
Aglantha digitale is unique among known jellyfish in having giant axons in the subumbrella (the concave inner surface of the bell) which are involved in its rapid escape response
[read more: buff.ly/3u60ZTJ]
917
In 2011, Japanese telecom company Docomo created one of the most beautiful adverts we've ever seen. A giant xylophone in Kyushu playing Bach's "Jesu, Joy of Man's Desiring" with a wooden ball rolling down its keys [full video, HD: buff.ly/2WuiMTQ]
918
This very popular video by Jane Hunter shows how corvids share an interesting set of behaviors with humans, especially because they a so playful animals' family
[read more: buff.ly/3GngsUa]
[source, HD: buff.ly/3FikrzV]
919
This site visualizes position and motion of all publicly registered satellites in orbit: celestrak.com
920
The Mayan city of Chichen Itza is full of architectural & engineering marvels. But El Castillo does even more: clap your hands at the base of the stairs and the song of a sacred Mayan bird will echo through the air [source: buff.ly/3iHZt2z] [more: buff.ly/2Fsl1wR]
921
There is more than a way to inflate a plastic bag and this clip explains how to do it with a *single breath* using science and the Bernoulli's principle
[source, Wolf_science: buff.ly/3kRMRJl]
922
The Japanese technique called Daisugi, enables foresters to grow more wood using less land and consists in heavy pruning of a mother cedar tree, which encourages tall, thin saplings to shoot upwards. In other words, think of it as a bonsai on a large scale ow.ly/ukzy50B0MO5
923
Magnetically assisted gears work with no mechanical contact. The input shaft never touches the output shaft unless the gear box is overloaded
[video: buff.ly/3e8dqHB]
[read more: buff.ly/3vBVbQQ]
924
You can make a phonograph with a piece of paper and a needle
[more detailed video DIY: buff.ly/3XH3JEA]
925
The lyrebird of the genus Menura can imitate the calls of at least 20 species of birds and more interestingly, other sounds it hears. David Attenborough shows one imitating a variety of unexpected sounds
[full video, BBC Earth: buff.ly/32Qrehn]
Astronomy, astronautics, meteorology, physics. Engineer, trying to build the big picture of #science via selected & curated pics, videos & links