For many people, Bike to Work Day (which is today) is a reason to put air in their bike's tires and see if their chain is too rusty to get them to work on time. And as a growing list of photographs shows, many people who follow NPR online also ride to work.
NASA and SpaceX partnered closely to make the mission to the International Space Station possible. Above, the SpaceX control room.
A SpaceX rocket waits to be launched at Cape Canaveral, Fla., in March. If all goes as planned, the private company's rocket will be the first commercial spacecraft to visit the International Space Station.
SpaceX founder Elon Musk runs his rocket company like a Silicon Valley tech firm. "That's the operating system that I have in my head of how to run an organization. And that's how I've created SpaceX," he says.
A private spaceship owned by a company called SpaceX is scheduled to blast off from Cape Canaveral in Florida early Saturday morning.
If all goes well, the unmanned capsule will rocket up on a mission to deliver food and other supplies to the International Space Station, becoming the first commercial spacecraft to visit the outpost.
The highly anticipated mission could mark the beginning of what some say could be a new era in spaceflight, with private companies operating taxi services that could start taking people to orbit in just a few years.
The prosecution's star witness underwent a withering cross-examination on Thursday at Roger Clemens' perjury trial. Clemens, a seven-time Cy Young Award winner, is charged with lying to Congress when he testified that he never used performance-enhancing drugs. Brian McNamee, his one-time trainer, is the only witness who has firsthand evidence that contradicts the baseball-pitching ace.
Earlier this week, guided by the prosecution, McNamee testified in agonizing and repetitive detail about how he injected Clemens with steroids and human growth hormone between 1998 and 2001.
Documents have been released in the investigation of George Zimmerman's shooting of Trayvon Martin. Zimmerman, a neighborhood watch captain, shot Martin, an unarmed teen. He's claiming self-defense. Robert Siegel talks to Greg Allen.