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The Mk. 1 caesium clock at the Science Museum, London.

File photo: Photo: Richard Ash, via Wikimedia Commons, CC BY-SA 2.0.

The Indeks · Science

The leap second is dead. Long live the leap hour.

Timekeepers voted in Versailles to abolish the leap second, the extra second added 27 times since 1972 to keep atomic clocks in step with a wobbling planet. The replacement is patience: let the two drift apart, and fix it with an hour when it finally matters.

Samples of graphene quantum dots produced at a US Department of Energy laboratory.

File photo: Photo: U.S. Department of Energy, via Wikimedia Commons, Public domain.

The Indeks · Science

A voltage just taught graphene to switch its magnetism on and off

Cornell researchers have shown that applying a voltage to four layers of graphene slides the layers into a new pattern, flipping the material between nonmagnetic and magnetic states that stay put when the power is removed.

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