Feature

Five Planets Now Visible

Uranium Is Too Scarce for Use as Source of Fuel

Cancer Cells Transformed

Parachuted Flares Aid in Charting Locations

Nature Ramblings: A Worsening World

Less Light for Eye Work

Barn Swallows’ Nests Made from Pellets of Mud

Nature Ramblings: Mushroom Growth

Jet Planes Need Cooling

Books of the Week

New Machines and Gadgets

Front Matter