30 November 2014
15 November 2014
What Gives Gold that Mellow Glow?
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 naïve 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
13 November 2014
12 November 2014
10 November 2014
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.
09 November 2014
07 November 2014
▶ 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.
06 November 2014
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