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Humans could be walking on Mars within the next couple decades, for only a fraction of the cost if explorers are given one-way tickets. It’s not a suicide mission, say cosmologists.
Legendary physicist Sir Roger Penrose says he has found the first evidence of an eternal, cyclic cosmos that is refreshed by Big Bangs, of which there have been many.
We tend to prefer a world in which wealth is more evenly distributed, even if it means we have to get by with less. Jonah Lehrer says inequality is our original sin.
Scientists at Europe’s best particle-physics laboratory have been able to trap a very small amount of antihydrogen—the simplest type of anti-atom—for the first time.