1376
The extraordinarily complex and beautiful floor in the cathedral of Santa Maria del Fiore, Florence
[close up details: buff.ly/3z6qs2v]
1377
Non-Newtonian fluids turn into solids when pressure is applied. It's called the process of impact-activated solidification that occurs when compressive forces are applied to fluid-grain suspensions
[📹 University of Chicago: buff.ly/2NB5r7r]
1378
You may not believe that your cat was born with a predatory instinct because it's a so playful critter, but it looks like cats are responsible for the global extinction of 33 animal species & responsible for the deaths of 6.9-20.7 billion mammals annually buff.ly/2s8mL91
1379
The Spinning Dancer is a kinetic, bistable optical illusion resembling a pirouetting female dancer. Some observers initially see the figure as spinning clockwise & some counterclockwise. Some can see it change rotation direction suddenly
[read more: buff.ly/2KM24au]
1380
This video by Tod's Workshop shows a 160lbs English warbow shooting full weight medieval arrows at a reproduced armour in a sort of medieval mythbusting
[full video, Tod's Workshop: buff.ly/3JhpEv1-]
1381
If you put some soap or ink on a leaf, you obtain a ink propelled boat, using the Marangoni effect. The ink or the detergent has a lower surface tension than water and its flow provides thrust to push the boat forward
[more: buff.ly/2tnyzW6]
[📹 buff.ly/3yUhS5D]
1382
The behavior of a wave reflecting at a boundary on the wave machine depends on whether the boundary is free or clamped
[source, full video: buff.ly/2GngGdT]
1383
At first glance this photos by Andre Ermolaev looks like a twisting abstract painting, but in reality it's an aerial photo of rivers flowing through Iceland’s endless beds of volcanic ash
[source, more pictures: buff.ly/2CQYJIY]
1384
We still don't know where eels come from. The general consensus is that adult eels migrate to the Sargasso Sea to spawn offspring, but no adult eel has ever been observed migrating in the open sea and nobody has ever seen two eels mate
[read more: buff.ly/3fZEZBE]
1385
Despite fire retardant or water are or should be dropped from much higher altitude, this is why you avoid dropping water or fire retardant directly on buildings, when possible [source and full video: buff.ly/329gzO3] [watch an example of altitude: buff.ly/3g7n8s9]
1386
The Bentley collection is an immense library of snow crystal photomicrographs, entirely available on line [visit: buff.ly/2gpIGkp]
1387
The Turkish coffee looks like an apparent violation of the laws of thermodyamics, but there's a pretty simple way to brew it
[read more: bit.ly/2fGy5n2]
[📹 buff.ly/3EqzSFC]
1388
The Pythagorean theorem is a celebrity:
a² + b² = c²
But most of us think the formula only applies to triangles and geometry. Think again. The Pythagorean Theorem can be used with any shape and for any formula that squares a number. Like circle areas
ow.ly/bHlw30nJqHe
1389
This Vietnamese woman making a fishing net, captured by photographer Danny Yen Sin Wong, looks as if she's swimming in a sea of green fire
[source, read more: buff.ly/2IUqRfs]
1390
A sunken lane (also hollow way or holloway) is a road or track that is significantly lower than the land on either side, not formed by the (recent) engineering of a road cutting but possibly of much greater age [read more: buff.ly/2rUgHSp]
1391
What happens to a jet when one of its engine fan blades disintegrates in flight? Hopefully, not much. That's what Rolls Royce was out to prove when they tested an Airbus A380 engine. If a fan blade fails in flight, the engine needs to contain it
[video: buff.ly/3a8SlKQ]
1392
Hura crepitans is also known as sandbox tree or dynamite tree. It's covered in spikes, it has a caustic, poisonous sap used by fishermen to poison fish and has explosive fruits whose seeds can be launched at 70 meters per second (252 km/h) [read more: ow.ly/EICl30nI4Nx]
1393
Dubbed Los Caracoles (snails), this is a portion of the CH-60, also called Ruta 60. It connects Santiago to Chile to Argentina through the Andes Cordillera. Its distinctive trait is this set of 29 hairpin turns
[read more: buff.ly/3Fa2sz9]
1394
Zeugma is a 2,200 year old city located in modern Gaziantep Province, Turkey and it's one of the largest mosaic museums in the world. In 2014, this magnificent mosaic depicting the nine muses was discovered
[read more: buff.ly/3C9zQCe]
1395
JamHamster built this virtual tape deck with a cassette tape shell and the head from a cassette audio adapter using an Arduino Nano to store tape data files and replay them to load software on a ZX Spectrum +2
[read more: buff.ly/3h8x2u1]
1396
This is what happens when two bubble rings collide
[source: buff.ly/3Dns5eL]
[the physics of a vortex reconnection: buff.ly/2SdU3zZ]
1397
This carved mahogany writing table is said to have been crafted specifically for use by King Carlo Alberto of Sardinia (1798-1849). It has a surprising number of unusual secret compartments
[source, m.s.rau_: buff.ly/3sgBLRQ]
1398
Century-old footage of the last known Tasmanian tiger in captivity has been brought to life by colourisation performed by Samuel François-Steininge, offering a tantalising glimpse of the now-extinct creature
[read more: buff.ly/3l5L1UU]
1399
Believe it or not, thousands of hedgehogs come through the doors of veterinary clinics every year, and around two thirds of them will require an X-ray. This is how it's generally performed
[read more: buff.ly/3SqdKm3]
[📷 Dr. Longissimus]
1400
A series of videos published by photographer Xavier Hubert-Brierre in 2012 ("le miroir en forêt") shows the footages of jungle creatures seeing their own reflections in a mirror for the first time
[full video, read more: buff.ly/3mOOZ30-]
Astronomy, astronautics, meteorology, physics. Engineer, trying to build the big picture of #science via selected & curated pics, videos & links