Today's headlines from CNN for US

U.S.  CNN.com/US  Leonard Nimoy, 'Star Trek's' Spock, dead at 83 Leonard Nimoy, whose portrayal of "Star Trek's" logic-driven, half-human science officer Spock made him an iconic figure to generations, died Friday. He was 83. FULL STORY A scientific tale of two dresses Before you strangle your best friend who sees the colors in the now-famous dress differently than you do, please know that there's a scientific explanation. FULL STORY Spacewalk is a 'go' despite water found in helmet Astronauts on the International Space Station will make a spacewalk Sunday despite the appearance of water inside an astronaut's helmet after a spacewalk earlier this week, NASA reported Friday on its website. FULL STORY Florida officers under fire after slapping, dragging incidents caught on video Two South Florida law enforcement officers are under fire after witnesses used their cell phones to capture footage of them possibly mistreating arrestees. FULL STORY