AP Top Science News at 6:55 p.m. EDT

NASA’s first asteroid samples land on Earth after release from spacecraft

Science paints a new picture of the ancient past, when we mixed and mated with other kinds of humans

Surgeons perform second pig heart transplant, trying to save a dying man

Birthplace of the atomic bomb braces for its biggest mission since the top-secret Manhattan Project

Historians race to find Great Lakes shipwrecks before quagga mussels destroy the sites

AP PHOTOS: In the warming Alps, Austria’s melting glaciers are in their final decades

NASA spacecraft delivering biggest sample yet from an asteroid

The fall equinox is here. What does that mean?

Biologists in slow and steady race to help North America’s largest and rarest tortoise species

Workers uncover eight mummies and pre-Inca objects while expanding the gas network in Peru

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