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Opinion, arguments & analyses from guest experts and from the editors of Scientific American

Knee Replacements on Shaky Scientific Ground

As the U.S. population ages and continues packing on the pounds, knee replacement surgeries are becoming increasingly common. More than 650,000 total knee replacements were performed in 2008 (according to the latest data available).And as materials and surgical technologies improve, the promise of newer and better implants is making the procedure even more appealing to the millions of people who suffer from arthritis of the knee...

March 5, 2012 — Katherine Harmon

Stop This Absurd War on the Color Pink

Last week Robert Krulwich, a co-host of the wonderful program Radiolab, Pluto'd pink. In a blog post he noted that pink doesn't occupy a slot in the familiar colors of the rainbow—there's no P in Roy G...

March 5, 2012 — Michael Moyer

Ponytail Physics: How Competing Forces Shape Bundles of Hair

BOSTON—At long last, one of the hairiest problems in modern physics has been solved. Researchers have devised a theoretical model to describe the shape of a ponytail.A ponytail may look like a relatively simple object, but in truth it is a bundle of physical complexity...

March 3, 2012 — John Matson

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