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Physicists find a way to probe the quantum realm without wrecking everything

Finally...!

In 1930, German theoretical physicist Werner Heisenberg came up with a thought experiment, now known as Heisenberg’s microscope, to try to show why it’s impossible to measure an atom’s location with unlimited precision. He imagined trying to measure the position of something like an atom by shooting light at it.

Light travels as a wave, and Heisenberg knew that different wavelengths could give you different degrees of confidence when used to measure where something is in space. Short wavelengths can give a more precise measurement than long ones, so you’d want to use light with a tiny wavelength to measure where an atom is, since atoms are really small. But there’s a problem: light also carries momentum, and short wavelengths carry more momentum than long ones.

That means if you use light with a short wavelength to find the atom, you’ll hit the atom with all of that momentum, and that kicks it around and risks completely changing its location (and other properties) in the process. Use longer wavelengths, and you’ll move the atom less, but you’ll also be more uncertain about your measurement.

Anticipating the arrival of friends and family, making eye contact, holding a child’s hand — these are the experiences and memories that give someone the resilience they need to make it in prison. A visit can alleviate the suffering that comes cold confinement and the brutality of unpredictable violence that erupts between inmates.

Over 600 prisons in 46 states have some sort of video visitation system, and every year, more of those facilities do away with in-person visitation. This isn’t just a financial burden on inmates and their families — but a contribution to the endless criminal justice system cycle.

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Super Mario World 2: Yoshi’s Island

During the Apollo 17 mission, in 1972, the rear fender of the lunar rover broke and lunar dust soon became a problem. This is how astronauts Cernan and Schmitt repaired the fender, with clamps, duct tape and lunar maps. [3000 x 3000]

Source: http://spaceflight.nasa.gov/gallery/images/apollo/apollo17/hires/as17-137-20979.jpg

Appearing before a congressional panel, government officials and Apple representatives showed no sign of compromise in their battle over encryption and privacy.

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That’s a lot of doors

This $99 accessory turns your smartphone into a 3D printer