Melvin Perez

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In Life, Man Immune To HIV Helped Scientists Fight Virus

Stephen Crohn, a man best known for staying alive during the early days of the AIDS epidemic, died Aug. 23 at age 66. Throughout his lifetime, the New York artist helped researchers uncover vital clues about HIV and how to stop it.<p>Crohn's partner was one of the first people to die from AIDS in …

How To Make A Beach Clean Itself

Redirecting runoff underground could make for a much more pleasant day at the beach<p>In 2011, water pollution closed or drove visitors away from U.S. shores on more than 15,000 beach days across the country. In many places, the problem is getting worse. As coastal towns crowd with rooftops and …

The Week In Numbers: Sad News For Life On Mars, Earth's Smallest Car, And More

<b>1.3 parts per billion</b>: the maximum concentration of methane in the Martian atmosphere, according to a new analysis from the rover Curiosity (sadly, this means the red planet is probably not home to living organisms)<p><b>260 million</b>: the number of surfaces in this astounding room designed by computer …

A Giant Teddy Bear And Other Amazing Images From This Week

11 Terrifying Childcare Inventions From The Early 20th Century

Enjoy the motorized hanging cradle, the baby gas mask, the UV-ray baby branding prod, and more "infant-friendly" gadgets from the Popular Science archives.<p>Updated:<p>There are certain areas of expertise that came naturally to us over the years: cars, space, aviation, and computers, to name a few. …