Salim S. Abdool Karim and Quarraisha Abdool Karim/ Photo: Courtesy of Caprisa

New gel reduces women’s risk of HIV

A new anti-HIV gel has been found to be safe and effective at lowering the chances of infection.
Sandro Galea

Wired for trauma

Epidemiologist Sandro Galea discovers that altered genes may trigger post-traumatic stress.

Elena Aprile

What holds us together?

Physicist Elena Aprile is close to spotting dark matter.

Bärbel Hönisch and mass spectrometer

C02 shell game

By analyzing the shells of single-celled plankton, Columbia geochemists have estimated past carbon dioxide levels in the sharpest detail ever.
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