In this issue:
"The Naked Truth": New findings point to the evolution of human hairlessness.
"Better Mileage Now": New upgrades to the internal-combustion engine will enable cars to become more fuel-efficient.
"Fixing the Global Nitrogen Problem": The devastating effects of nitrogen pollution and what the global community must do to decrease its effects.
"The Prolific Afterlife of Whales": The carcasses of the largest mammals give life to unique ecosystems.
©2010 Scientific American