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Physics

A predicted quasicrystal is based on the ‘einstein’ tile known as the hat

The einstein tile can cover an infinite plane only with a nonrepeating pattern. A material based on it has features of both crystals and quasicrystals.

Animals

A bird flu outbreak is sweeping the globe. Its long-term effects are unclear

A reporter’s recent trip to the Galápagos offered a chance to reflect on the bird flu outbreak, which has killed millions of birds and other animals.

Earth

Many but not all of the world’s aquifers are losing water

Many aquifers are quickly disappearing due to climate change and overuse, but some are rising because of improved resource management.