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Quantum computer figures out that 15 = 3 × 5

Prime factorization of large numbers makes online purchases with a credit card more secure. But physicists at the University of California, Santa Barbara, might have found a way to beat it. The issue now is time.



Obituary: Walter Cronkite

Longtime news anchor Walter Cronkite died at the age of 92. He brought us the news when we trusted those who do.