That moment that ketchup transitions from a solid, high up in the ketchup bottle, to a liquid that squirts all over your fries – that moment is a big physics moment. Why? Ketchup is a non-Newtonian fluid (like oobleck, peanut butter, custard, toothpaste, paint, blood, or quicksand) that can switch between a solid and liquid state, and ketchup is non-Newtonian in two different ways…
In that transition moment, ketchup may be responding to a strong, quick force, suddenly making it thinner, or if you’re patient and apply just a wee bit of force, it may start flowing given some time and gravity. Grab a ketchup bottle and get the details in this TED Ed lesson by George Zaidan, with animation by TOGETHER.
Related watching: oobleck, TED Ed, the incredible physics of ants, and more about that sugar in your ketchup.
Generate your own electricity with some wire, a magnetic field, and the relative movement between the two of them: Alom Shaha explains electromagnetic induction using this hand-powered – or perhaps more accurately, bacon-sandwich-powered – generator.
Related watching: magnetic fields, probably one of the more awe-inducing subjects on this blog.
via Science Demo.
When this flight paths of starlings video by artist and professor Dennis Hlynsky went viral, it sparked a lot of questions for us: How did he make the visualizations? How do the starlings move quickly as a flock? What makes other groups of animals move the way they do?
In Micromigrations from The Atlantic, Hlynsky discusses his own questions as we observe the water striders, ants, starlings, vultures, crows, and little white flying bugs that continue to inspire his curiosity and his work.
Watch starlings videos and explore more about the way animals (and robots) move, including water striders, cheetahs, cats, snakes, and hummingbirds.
Watch the flight paths of starlings as they make computer-assisted trails across the sky above the Seekonk Speedway in Massachusetts. Artist Dennis Hlynsky filmed them (and others) with a Lumix GH2 and then used After Effects to make their paths more visible from their own visually-echoed image. A time-lapse of sorts…
Related watching: swarms.
How can we know the size, composition, and atmospheric makeup of distant exoplanets? NASA explains the details in this Alien Atmospheres video.
By observing periodic variations in the parent star’s brightness and color, astronomers can indirectly determine an exoplanet’s distance from its star, its size, and its mass. But to truly understand an exoplanet astronomers must study its atmosphere, and they do so by splitting apart the parent star’s light during a planetary transit.
Watch more astronomy videos, including Measuring the Universe and The Hubble Ultra Deep Field.
via Boing Boing.