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Right now, solar panels make electricity. But a team of engineers in California wants to take solar energy one step further. They're trying to create a device that uses sunlight to make a liquid fuel that goes in our gas tanks.

When he was 17, Mike Brodie hopped a train with a Polaroid camera and a pack of film. About 10 years later, he doesn't hop trains and doesn't really photograph, either. But he does have a book out about those years.

Most animals leave their home turf when they reach adulthood to avoid competing with relatives. But here's an exception: More than three decades of dogged research shows that prairie dogs are more likely to disperse when all of their family members are gone.

In NPR's Elise Tries series, correspondent Elise Hu tries out different experiences in East Asia. In rapidly aging Japan, an edible innovation is helping seniors enjoy meals without fear of choking.

Jon Underwood, a British Web designer and self-named "death entrepreneur," helps people talk about the taboo topic over tea and cake. "When we acknowledge that we're going to die, it falls back on ourselves to ask the question, 'Well, in this limited time that I've got, what's important for me to do?' " Underwood says.