In this issue:
"The Dawn of Distant Skies": Scientists are straining to find signs of extraterrestrial life.
"Once Blind and Now They See": Surgery in blind children has revealed how vision works in the brain.
"Greenhouse Goo": Mining the tar sands of Alberta for oil could push the earth’s climate over the brink.
"When Animals Mourn": Mounting evidence from species as diverse as cats and dolphins indicate that humans are not the only species that grieves over the loss of loved ones.
©2013 Scientific American