Why did China crash the yuan?

Why did Beijing decide to let the yuan depreciate. That question has vexed economists and investors alike in recent days

from Business and financial news – CNNMoney.com http://ift.tt/1L7Up4p
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Sound Can Knock Drones Out of the Air

Some drones have an Achilles heal, and it doesn’t sound good.
Researchers at the Korea Advanced Institute of Science and Technology (KAIST) have demonstrated the ability to knock some types of drones out of the sky using sound, or more specifically, resonance. When you run your finger over a wine glass to make a sound, you are hitting the natural resonant frequency of the glass. When you hit the resonant frequency of some popular drone models’ gyroscopes, they start behaving badly.
Sound

from Discover Magazine http://ift.tt/1hjYJ3P
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