NASA's Voyager 1 has reached the final frontier of our solar system. Audie Cornish talks with Ed Stone, chief scientist of the Voyager mission, about the spacecraft's discovery of a magnetic highway at the very outer edge of the solar system.
Despite its name, the "pot pig" experiment isn't an attempt to develop a new meaty treat for stoners. Instead, a Seattle butcher is feeding marijuana seeds, stems and root bulbs to swine as a cheeky money-saving measure.
Under Douglas Shulman's watch, IRS personnel singled out some conservative groups for extra scrutiny. That, he conceded Tuesday, has "justifiably led to questions" about the tax agency's motivation.
When news of Yahoo's purchase of Tumblr first hit, Tumblr users took their reactions online. The posts were quirky and sharp with plenty of worry about the future.