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The rock called Maka Lahi is important in the mythology of the people of Tonga, and scientists have worked out part of its origin story.

For months, the Harvard researcher Kseniia Petrova has challenged efforts to deport her to her native Russia for a customs violation. This week, the government charged her with a criminal felony.

He helped develop the device most often used for surgical abortions. He also spent more than half a century promoting women's reproductive health in developing countries.

Restrictions on payments to foreign partners may jeopardize studies of cancer and other conditions that would benefit Americans.

The technique used on a 9-month-old boy with a rare condition has the potential to help people with thousands of other uncommon genetic diseases.

The elimination of a key C.D.C. office has slashed funding to states for help lines used by thousands to stop smoking and vaping.

The progress comes as the Trump administration is proposing to cut funding for many programs believed to have contributed to the improvement.

Kseniia Petrova, a Harvard researcher, was detained Feb. 16 at Logan Airport after failing to declare scientific samples she carried into the U.S.

A serendipitous solar outburst let scientists point the robot's cameras toward the Red Planet's sky to spot a feature shared with our Blue Marble.

Many scientists contributed to the final result, but he was the one who, as a young physicist, designed the world's deadliest weapon. He went on to advise a dozen presidents.