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Earth

With warming, Arctic is losing ground

Scientists anticipate big ecosystem changes as erosion spills nutrients into the sea

Space

Former planet may have grown a tail

Pluto appears to trail a cometlike cloud of gas.

Health & Medicine

Body & Brain

A genetic cause for small brains, heart links to HIV and calcium, and more in this week’s news.

Life

Zap! More fish

An upgraded brain underlies the wide diversity in a family of electric fish, scientists say.

Earth

Currents reach deep for seafloor larvae

Surface waters circulate more than a mile down, transporting organisms between distant ocean-bottom habitats.