Features

• Is the Universe Leaking Energy?

  Total energy must be conserved. Every student of physics learns this fundamental law. The trouble is, it does not apply to the universe as a whole

  Tamara M. Davis   | July 1, 2010  | 121

• The Dirty Truth about Plug-In Hybrids

  How green is that electric car? Depends on where you plug it in

  Michael Moyer   | July 1, 2010  | 66

• Clean Energy from Filthy Water

  California cities are pumping their treated wastewater underground to create electricity

  Jane Braxton Little   | July 1, 2010  | 1

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  War of the Machines: A Dramatic Growth in the Military Use of Robots Brings Evolution in Their Conception

  Robots on and above the battlefield are bringing about the most profound transformation of warfare since the advent of the atom bomb

  P. W. Singer   | July 1, 2010  | 20

• Winged Victory: Modern Birds Now Found to Have Been Contemporaries of Dinosaurs

  Modern birds, long thought to have arisen only after the dinosaurs perished, turn out to have lived alongside them

  Gareth Dyke   | July 1, 2010  | 3

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  How Babies Think

  Even the youngest children know, experience and learn far more than scientists ever thought possible

  Alison Gopnik   | July 1, 2010  | 9

• The Drillers Are Coming: Debate over Hydraulic Fracturing Heats Up

  Companies and regulators are squaring off over the controversial technique that yields natural gas but threatens to pollute freshwater supplies

  Mark Fischetti   | July 1, 2010  | 10

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  DNA Drugs Come of Age

  After years of false starts, a new generation of DNA vaccines and medicines for HIV, influenza and other stubborn illnesses is now in clinical trials

  Matthew P. Morrow and David B. Weiner   | July 1, 2010  | 3