851
The Indian Bullfrog may not look like much, but its appearance can change dramatically. During most of the season, both genders are a rather dull kaki-olive-green, but once the mating season comes around, things change drastically [read more: buff.ly/2jm7T31]
852
There are many ways to get across the point of distortion in the Mercator map. Here's a planisphere indicating a distance across Africa and another distance across Russia and things don't add up
[source, read more: buff.ly/3HGVLme]
853
A photographic worthy natural phenomenon occurs every year in Lake Baikal. Masses of broken ice look like shards, transparent and shining in a turquoise color, caused by the slow and unequal pressure in the main body of the packed ice
[read more: ow.ly/BxfU50xoCrn]
854
Bobcats can easily jump several meters and if they are jumping across something, like this weir in Pecan Island, Louisiana, their leap can reach 6 meters
[read more: buff.ly/3pwZxbr]
[source, Ryan Olivier: buff.ly/32F6f6y]
855
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]
856
When cayman's eggs fail to hatch, cayman moms crack the eggs with their mouth, breaking the hard shell first and then piercing the inner leathery membrane, until the young cayman is born
[full video: buff.ly/2LSoU3t]
857
A facial reconstruction project focusing on ancient Egypt on some of its pharaohs and even normal people
[full video: buff.ly/3TRSeI1]
858
Tower climber Kevin Schmidt shows what it takes to change a lightbulb on the top of a 457 meter high television broadcast antenna over the South Dakota plains while being filmed by a quadcopter [source and full video: buff.ly/2QiP2Fk]
859
"Purple Phoenix" is a sculpture by Jack Storms designed using a cold-working lathe. There is no heat involved in the process: the materials used on each one of Jack Storms’ glass sculptures are 32% optical lead crystal, optical crystal and dichroic glass jackstorms.com
860
This is the Teotihuacan pyramid of the Sun before the excavations at the beginning of the XX century vs now. A simple hill covered by bushes and trees.
[see the early pictures of the pyramids: buff.ly/3i4oUjV]
861
This image shows what would happen if all of the water on or near the surface of the Earth were bunched up into a ball. The radius of this ball would be only about 700 kilometers, less than half the radius of the Earth's Moon [source: buff.ly/2LvbzOM]
862
WindPal is a practical solution for outdoor lovers to charge their devices. It’s a lightweight (less than 1 kg), portable wind turbine that generates power. And it can be assembled in less than one minute [video: buff.ly/2JaV6ff]
863
Whale shark eating
[whale sharks' diet: buff.ly/2LHYCCd]
[📹 BBC America: buff.ly/3W5GG55]
864
The Butterfly Mendocino Motor by Semyon Nazarov is the simplest version of this kind of motor with only two photovoltaic cells mounted with care to ensure precision balance. This motor will spin quietly to high RPMs on any sunlit windowsill [read more: buff.ly/3qGqGpJ]
865
Wanna see how a new island is made? Watch the Kavachi undersea volcano as it erupts underwater in the middle of the Pacific Ocean, in the Solomon Islands
[full video: buff.ly/2HvCzsT]
866
As this remarkable picture by photographer Hemant Kumar shows, flying fox young bats ride clinging to their mother's breast with their mouth, even though some young are two-thirds the weight of their mothers & quite capable of flying on their own [source: buff.ly/300N3vb]
867
Cats place each hind paw directly in the print of the corresponding fore paw, minimizing noise and visible tracks
[read more: buff.ly/3JI6VYS]
[source: hanamomo]
868
The golden eagle is considered one of the most powerful predators. Yet, in this video filmed by Terra Mater & Omar Penker on the European Alps, a chamois shows how, seriously risking its own life, it finally saves it [full story: buff.ly/3c2IN8n]
869
Considering pictures or long-distance views, you might have a somewhat static perception of an aurora. This real time video by Matthew Robinson give you a hint how dynamic and colorful are northern lights in the sky [source: buff.ly/2ZWniPO-]
870
See the unseen and explore the world of vibration watching this drum cymbal in motion at 1,000 frames per second [source and full video by Fluke Corporation: buff.ly/2Fk4sqx]
871
When bison returned to Badlands National Park after nearly 150 years. In October 2019 they celebrated the park opening up 22,000 acres of new bison range and almost 1,200 bison now have 80,000 acres to graze, after being absent since 1870 [read more: buff.ly/2MhVvQT]
872
These are drops of blood, plasma and water bead up when placed on the superhemophobic titanium
[source, Colorado State University: buff.ly/2DEJSSp]
873
Ever wondered why your fingers go wrinkly in water but not other parts of your body? It's not a simple reflex or the result of osmosis. Our fingers wrinkle in water due to an evolutionary response that enhances our grip underwater [read more: bbc.in/1UopCzM]
874
This composite was taken by photographer Bill Church over the course of 12 minutes: 35 photos imaging a storm approaching in Utah [author's Flickr: buff.ly/2PgO0gW]
875
A visualization of the lowest density of ice vs water. When a huge, mainly submerged mass of ice detach from an iceberg, the surfacing action can create temporary but very impressive pillars of ice [full video, YT channel Skeater: buff.ly/2ARkrLO-]
Astronomy, astronautics, meteorology, physics. Engineer, trying to build the big picture of #science via selected & curated pics, videos & links