He is a second Dirac, only this time human.
Robert Oppenheimer’s letter of recommendation for Richard Feynman.
Quantum Levitation
This video demonstration is in something called Quantum Levitation, a phenomenon that results from the fact that superconductors and magnets tend to not like each other.
When possible, the superconductor will expel all the magnetic field from inside. This is the Meissner effect. In our case, since the superconductor is extremely thin, the magnetic field DOES penetrate. However, it does that in discrete quantities called flux tubes.
Inside each magnetic flux tube superconductivity is locally destroyed. The superconductor will try to keep the magnetic tubes pinned in weak areas (e.g. grain boundaries). Any spatial movement of the superconductor will cause the flux tubes to move. In order to prevent that the superconductor remains “trapped” in midair.
Cat Physics (PDF).
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Droplet collisions captured instantaneously create beautiful fluid sculptures that, though common, are too fast for the human eye. Here a bubble was blown onto the surface of the fluid, then a droplet was released to fall into the center of the bubble, bursting it. As that droplet rebounded in a Worthington jet, a second droplet was released and impacted the jet, creating the umbrella-like shape in the center. See Liquid Droplet Art for more photos. (Photo credit: Corrie White and Igor Kliakhandler) #
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Image shows the solution of iron oxide in water changing color under a magnetic field, with increasing strength of the field from left to right.
Source: A Simple Magnet Can Control the Color of a Liquid, University of California Riverside
