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IBM quantum computer

SEEKING QUANTUM SUPREMACY  Google, IBM and others are developing quantum computers. IBM has made its five-qubit computer accessible online for free, and the company is planning a 50-qubit computer for commercial use. The large tank shown here holds the cooling system that keeps a 17-qubit processor cold.

painting of Caesar’s last moments

OUT OF BREATH  Caesar’s last moments have inspired much scientific thinking, as well as a new book.

rolling luggage

ROCKIN’ ROLLER Physicists give the play-by-play of what makes rolling luggage rock back and forth.

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