2226
Music theory has no axiomatic foundation in modern mathematics, yet the basis of musical sound can be described mathematically. One example comes from Dylan Tallchief, who created a complete digital music studio app in Excel [📹: buff.ly/3ezmUtb]
2227
Originally created by Arthur Shapiro and Alex Rose-Henig of American University, this illusion starts with dots moving along linear paths, but soon something different emerges, a rolling circle
[read more, video: buff.ly/2EGVChD]
2228
Thailand’s Moken sea gypsies can see twice as clearly underwater by controlling the size of their pupils. But what was generally considered an automatic reflex for the rest of us, is now thought to be something that any child under 5 could learn how to do buff.ly/2oBKVur
2229
Living root bridges are a form of tree shaping common in the southern part of the Northeast Indian state of Meghalaya. They are handmade from the aerial roots of Rubber Fig Trees by the Khasi and Jaintia, peoples of the of the Shillong Plateau [read more: buff.ly/2vjUzES]
2230
This photo of two brothers in Sequoia National Park was taken moments before they got struck by lightning in August 1975 and it was used for years to warn about the dangers of pending lightning strikes [full story: buff.ly/2H3m1IA]
2231
On April 27, 2012, a team of scientists and tv studios intentionally crashed an uncrewed Boeing 727-200 to test which seats had the best chance of survival
[Discovery Channel: buff.ly/3Uc22NY]
[read more: buff.ly/2WHddPI]
2232
It's not neither easy nor frequent to spot a humpback whale with a newborn calf. This extraordinary observation was made with a drone by the University of Hawaiʻi at Mānoa’s Marine Mammal Research Program in January 2019 [full story and full video: buff.ly/2onTLfp]
2233
A graphic tester like the Geekcreit GM328A can easily identify the components connected to the pins, detecting PNP, NPN bipolar transistors, resistors, capacitors and inductors
[video: buff.ly/3RCoez5]
2234
Monitoring your health may get a lot easier thanks to this technology developed by a team of researchers in Germany. They created tattoos that change color according to the body’s levels of glucose and albumin or its pH [read more: ow.ly/rZ1m50wvf4U]
2235
The wing of a fruit fly, viewed against a white background, looks very ordinary. But if you put the wing in front of a black background, it suddenly explodes in a kaleidoscope of colour. This is a female Closterocerus coffeellae shining against black buff.ly/2Nkl0AC
2236
For nearly 200 years we knew that spiders could move through the air & "fly" but we never understood exactly how. Only a recent series of studies found that spider's ballooning relies on the Earth eletricity field, or Global atmospheric electrical circuit buff.ly/2tXCxFF
2237
The sand bubbler crab eats detritus/plankton and discards the processed sand as pellets, which cover the beach. In a similar way it builds its burrows where it remains during high tide
[read more: buff.ly/2N11pmk]
[📹 buff.ly/3CF0Ats]
2238
21 years ago #Today, astronaut Frank Culbertson was on the International Space Station during Expedition 3 and witnessed the September 11th attacks from space [read more: buff.ly/3hleJE4] #September11
2239
Bismuth crystals exhibit a stairstep crystal structure with iridescence colors, produced by interference of light within the oxide film on its surface.
This is how you make them.
[📹 sapphire_shores_emporium: buff.ly/3B0T2Cq]
2240
The weedy seadragon (Phyllopteryx taeniolatus) has small leaf-like appendages that resemble kelp fronds providing camouflage and a number of short spines for protection, plus an often iridescent body
[📹 Harry Cassio: buff.ly/3qr7IWA]
2241
This animation shows every recorded earthquake in sequence as they occurred from January 1, 1901, through December 31, 2000, at a rate of 1 year per second
[source, read more, NOAA: buff.ly/3eIHHiI]
2242
Brazilian frogs which have evolved to be very tiny, have inner ear canals too small to help them balance well: this is why they are clumsy jumpers
[full paper: buff.ly/3RUyZMU]
2243
Space Glass is a handmade array of glass, metals and crystals in multiple layers, encapsulating planets and stars in glass [read more: plusalpha-glass.com]
2244
Tonight while you sleep, you'll be kind of 'brain washed'. Your neurons will go quiet. Blood will flow out of your head, a watery liquid called cerebrospinal fluid will flow in, washing through your brain in rhythmic, pulsing waves [source, read more: buff.ly/2KuDnll]
2245
Jules Verne wrote a novel in 1863 which predicted gas-powered cars, fax machines, wind power, missiles, electric street lighting, maglev trains, the record industry, the internet, and feminism. It was lost for 131 years & just published in 1994 buff.ly/2nh9g8R
2246
The story of Maurice Hilleman, the biologist who developed over 40 vaccines, among which measles, mumps, hepatitis, chickenpox, meningitis, pneumonia: an unparalleled record of productivity that saved more lives than any other scientist of the 20th century buff.ly/2o9ChmY
2247
Diver Kendall Roberg built a rig with marker caps attached to his GoPro to show how colors change as you go deeper underwater, because water selectively scatters and absorbs certain wavelengths of visible light [video: buff.ly/2SdfUq5] [more: buff.ly/2n7iODf]
2248
In 1881, the Harvard Observatory director was frustrated with his staff, and would say "My Scottish maid could do better!" He hired his Scottish maid. Williamina Fleming classified tens of thousands of stars, discovered white dwarfs & the Horsehead nebula buff.ly/2mFX8vw
2249
Rabbits can swim
Some breeds adapted to live in wet environments, and regularly swim in their day-to-day lives
[read more: buff.ly/3gNq0N5]
[source: buff.ly/3BnSGFE]
2250
A bridge girder machine drives the girder onto the previously placed one, slowly extends its arms to the next support platform, pushes the girder towards the front of the machine and then lowers it into place
[📹: buff.ly/3TZNAZ3]
Astronomy, astronautics, meteorology, physics. Engineer, trying to build the big picture of #science via selected & curated pics, videos & links