Researchers reveal world's most precise metronome Hamburg, Germany (UPI) Jan 12, 2017 - Scientists in Germany have synchronized a system of lasers with record precision. The metronome's laser-microwave network stretches a kilometer wide, or 3,280 feet, and is synched within 950 attoseconds. One attosecond is a millionth of a millionth of a millionth of a second, or a quintillionth of a second. One femtosecond is a quadrillionth of a second, or a millionth of one billionth. ... more

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