US scientists debut atomic clock that stays true for 100 million years straight | NIST-F4 is America’s bid for precision timekeeping dominance, accurate to 2.2 parts in 10 quadrillion and critical for finance, GPS, and data centers.

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3. US scientists debut atomic clock that stays true for 100 million years straight | NIST-F4 is America’s bid for precision timekeeping dominance, accurate to 2.2 parts in 10 quadrillion and critical for finance, GPS, and data centers.