WHY ARE BABIES SO CUTE?
What about those little bundles of joy do we find so compelling? Are we hard-wired to like “cute” things?Find out in this video.—-Some of them are obnoxious, mind you! (8()
Scale of the universe
Scroll to your hearts content from the Planck length to the diameter of the observable universe - click on any object and it will open an info box - I can’t imagine how much work must have gone into this. A few surprising things: Pluto has a smaller diameter than the width of the USA and Vatican city can fit in central park multiple times.
Find it here
Sally Lightfoot Crab-Grapsus grapsus is a typically shaped crab, with five pairs of legs, the front two bearing small, blocky, symmetrical chelae. The other legs are broad and flat, with only the tips touching the substrate. The crab’s round, flat carapace is slightly longer than 8 centimetres (3.1 in). Young G. grapsus are black or dark brown in colour and are camouflaged well on the black lava coasts of volcanic islands. Adults are quite variable in colour; some are muted brownish-red, some mottled or spotted brown, pink, or yellow. (sources 1,2)
Best Astrophotography of the Year, as chosen by the Royal Observatory Greenwich.
From both an existential and purely technical/photographic aspect, these shots blow my mind. Check out the full gallery of winners at My Modern Met.
(Top two images by Mark Gee, bottom image by Adam Block)
Bonus: Check out grand prize winner Mark Gee’s breathtaking video of a rising moon and tiny human silhouettes, pointing at it and ooh-ing and ahh-ing and generally marveling at the lunar awesomeness. It’s just … wow.
Newton’s third law says that forces come in equal and opposite pairs. This means that when air exerts lift on an airplane, the airplane also exerts a downward force on the air. This is clear in the image above, which shows a an A380 prototype launched through a wall of smoke. When the model passes, air is pushed downward. The finite size of the wings also generates dramatic wingtip vortices. The high pressure air on the underside of the wings tries to slip around the wingtip to the upper surface, where the local pressure is low. This generates the spiraling vortices, which can be a significant hazard to other nearby aircraft. They are also detrimental to the airplane’s lift because they reduce the downwash of air. Most commercial aircraft today mitigate these effects using winglets which weaken the vortices’ effects. (Image credit: Nat. Geo./BBC2)
All this beautiful life we never see,
Making green fire involves mixing borax with ethanol and setting it alight in a pyrex/borosilicate vessel (normal glass will just crack and shatter from the heat).
This is just like a great big flame test. When boron compounds are heated, electrons absorb a certain amount of heat energy that causes them to jump to higher energy levels. After some time, the electrons lose this energy and fall back down to their original levels, emitting this energy in the form of light. Because the energy absorbed by electrons is different per element, each element will give a different colour. Boron gives a bright green colour. Any other colours such as orange and yellow are probably due to impurities in the mixture such as carbon.