Floaters look like small specks, dots, circles, lines or cobwebs in your field of vision. While they seem to be in front of your eye, they are floating inside. Floaters are tiny clumps of gel or cells inside the vitreous that fills your eye. What you see are the shadows these clumps cast on your retina. pc: @sourtruth
READ CAPTION How a Student Took a Photo of a Single Atom The award-winning long-exposure photograph captures a positively charged atom suspended in an ion trap. SOMETIMES, ALL IT takes to capture a great photo is a DSLR camera, a microscopic atom, and a curious Ph.D. candidate. David Nadlinger, who traps atoms for his quantum computing research at the University of Oxford, captured this image on August 7 using a standard DSLR camera. The photo shows a pinprick of a positively charged strontium atom illuminated by a blue-violet light on a black background. The atom is held nearly motionless by an electric field emanating from two metal electrodes placed on either side of it. The distance between the ion trap's small needle tips is less than .08 of an inch. The photograph, entitled "Single Atom in an Ion Trap," won the overall science photography prize put on by the UK's Engineering and Physical Sciences Research Council.
Superfluidity is the characteristic property of a fluid with zero viscosity which therefore flows without any loss of kinetic energy. When stirred, asuperfluid forms vortices that continue to rotate indefinitely. Superfluidity occurs in two isotopes of helium (helium-3and helium-4) when they are liquefied by cooling to cryogenic temperatures. It is also a property of various other exotic states of matter theorized to exist in astrophysics, high-energy physics, and theories of quantum gravity.The theory of superfluidity was developed by Soviet physicist Lev Landau.
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