In this issue:
"The Benevolence of Black Holes": The matter-eating beast at the center of the Milky Way may actually account for Earth’s existence and habitability.
"The Joyful Mind": A new understanding of how the brain generates pleasure could lead to better treatment of addiction and depression - and even to a new science of happiness.
"New Life for Ancient DNA": Biotechnology has revealed how the woolly mammoth survived the cold and other mysteries of extinct creatures.
"Deadly Rays from Clouds": The common thunderstorm can emit powerful blasts of gamma rays and x-rays – and even antimatter.
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