The shiny three leaves of poison ivy. Photo by Susan Biddle/The Washington Post/Getty Images. Ahh, summertime. A long wilderness hike followed by a refreshing swim in the river followed by -- music screeches to halt -- a…

List compiled by Rebecca Jacobson. Read our full Science Wednesday report. They have lungs, but they breathe completely through pores in their skin. Their name Cryptobranchus means “secret gill.” They are the third largest species of salamanders in…

The Mars Curiosity Rover team celebrates on Aug. 5, 2012, inside the spaceflight operations facility at the Jet Propulsion Laboratory as the first pictures appear on screen after a successful landing on Mars. Photo by Brian van der Brug-Pool/Getty…