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What Gives Gold that Mellow Glow?

In discussions of special relativity, you occasionally encounter a claim like, “The effects of special relativity only matter to particle physicists and others working with extreme energies and velocities. Relativity has no consequences in everyday life.” Well, these days, anybody who relies upon the Global Positioning System(GPS) to navigate their car or the airliner in which they're travelling uses both special and general relativity, because without correction for their effects, GPS would be so inaccurate as to be useless. But GPS is a recent innovation, and the relativistic corrections are both complicated and hidden from the user in the software in the receiver and on board the satellites. But there's an effect of special relativity which was observed, if not understood, by the ancients: the yellow gleam of gold.

With an atomic number of 79, gold is in the last row of theperiodic table containing stable elements, and only four stable elements (mercury, thallium, lead, and bismuth) have greater atomic number. With 79 protons in its nucleus, the electrons of the gold atom are subjected to an intense electrostatic attraction. Using the na├»ve Bohr “solar system” model of the atom for the moment, electrons in the 1s orbital, closest to the nucleus, would have to orbit with a velocity v of 1.6×108metres per second to have sufficient kinetic energy to avoid “falling into” the nucleus. This is more than half the speed of light: c≈3×108 m/s

Rosetta #CometLanding webcast on Livestream

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WE LANDED ON A COMET! Rosetta Mission A Success!: http://youtu.be/ZcXZ-6B6ejk

Elon Musk’s Next Mission: Internet Satellites

Elon Musk’s Next Mission: Internet Satellites The billionaire founder and CEO of Tesla Motors is setting his sites higher. He plans to launch a fleet of satellites to provide Internet service to millions who are now unserved.

Stain Removal Chart | Clean Living | American Cleaning Institute

Stain Removal Chart | Clean Living | American Cleaning Institute:

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Easy Tools for Bloggers to Bring Content to Flipboard


▶ Six great TextEdit tricks | Macworld

▶ Totally awesome and useful article.

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▶ How iOS 8 and Yosemite got me to stop jailbreaking my iPhone | Macworld

Great article on the improvements in iOS that make jail-breaking iPhones a nearly obsolete practice.

Brain-to-brain Interface: Folks, Things are getting Weird.

Brain to brain communications via http