Christy O'Donnell, who has advanced lung cancer, is one of several California patients suing for the right to get a doctor's help with prescription medicine to end their own lives if and when they feel that's necessary. YouTube hide caption

itoggle caption YouTube

Author and activist Bill McKibben paddles toward Follensby Pond in New York's Adirondack Mountains, along the route followed by Ralph Waldo Emerson in the summer of 1858. Julia Ferguson/NCPR hide caption

itoggle caption Julia Ferguson/NCPR

A manatee spotted in the Chesapeake and Delaware (C&D;) Canal on Thursday. It's very unusual for the Florida native to get so far north. Delaware Division of Fish and Wildlife hide caption

itoggle caption Delaware Division of Fish and Wildlife

"It now pays to get a lot of pleasure out of a little bit of sugar," says Danielle Reed, a scientist at the Monell Chemical Senses Center. Ryan Kellman/NPR hide caption

itoggle caption Ryan Kellman/NPR

For best quality of life, many cancer patients who can't be cured might do best to forgo chemo and focus instead on pain relief and easing sleep and mood problems, a survey of caregivers suggests. iStockphoto hide caption

itoggle caption iStockphoto

Artist's concept compares Earth (left) to the new planet, called Kepler-452b, which is about 60 percent larger in diameter. NASA/JPL-Caltech/T. Pyle hide caption

itoggle caption NASA/JPL-Caltech/T. Pyle