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Features

7 Radical Energy Solutions

The failure rate may be 90 percent, but if any of these exotic technologies succeeds, it could significantly improve energy security and efficiency

By The Editors, Graham P. Collins, David Biello, Bijal P. Trivedi, JR Minkel, Steven Ashley, Charles Q. Choi and Michael Lemonick

The Lost Galaxies

By the latest estimate, the observable universe contains 200 billion galaxies. Astronomers wonder: Why so few?

By James E. Geach

The Strangest Numbers in String Theory

A forgotten number system invented in the 19th century may provide the simplest explanation for why our universe could have 10 dimensions

By John C. Baez and John Huerta

Inner Spark: Using Music to Study Creativity

Hearing specialist and sax player Charles J. Limb says that studying the brain during flights of improvisation may provide new understanding of creativity—as well as insight into the musical genius of John Coltrane

By Alicia Anstead

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