Scientists who work for nuclear waste disposal projects in Finland, Canada and Sweden study an ice sheet in western Greenland. Courtesy of Vincent F. Ialenti hide caption

itoggle caption Courtesy of Vincent F. Ialenti

A worker drives an electric cart past air monitoring equipment inside a storage room of the Waste Isolation Pilot Plant in Carlsbad, N.M., shown in this undated photo. Anonymous/AP hide caption

itoggle caption Anonymous/AP

This laser's just pretty, not powerful: Artist Yvette Mattern's laser rainbow in Whitley Bay, England, earlier this year. Bethany Clarke/Getty Images hide caption

itoggle caption Bethany Clarke/Getty Images