IN THIS ISSUE

Articles

• An Ice Sheet’s Demise
  Greenland’s vanishing ice sheet portends more than 20 feet of sea-level rise.
• Little Laser, Big Science
  Discoveries are being made on two different planets with the same universally useful tool.
• Driving Sustainability
  Making our transportation system greener and more future-friendly.
• What Causes Cancer?
  The first large-scale inventory of cancer’s genetic fingerprints

Spotlights

• Diverting Doomsday
  Protecting Earth from cataclysmic comets might require nuclear rockets.
• Sterile Neutrinos
  In recent experiments, elusive subatomic particles stubbornly defy expectations.

In Their Own Words

• Aging Plutonium
  The rewards and challenges of doing science for national security