Plastic: it's used to make everything from drink bottles and bags to toys and toothbrushes. But what happens when it ends up where it doesn't belong like in the Pacific Ocean? How does it affect ocean life? Is it dangerous? And exactly how much is out there? A team of researchers went on a scientific expedition to find out. They explored the Great Pacific Garbage Patch, where millions of pieces of plastic have collected. The plastic has drifted there...

Panamanian golden frogs aren't just cute, little, and yellow. They're also the national symbol of Panama. But they started to disappear about fifteen years ago. What's killing them? Could it be a change in their habitat? What about pollution? Might it be a result of climate change? Follow a team of scientists working to save these frogs and protect frog populations worldwide in this real-life science mystery.

Sally M. Walker works alongside scientists as they excavate colonial-era graves and examine fragile 400-year-old skeletons. See what they can determine about these early Americans-a ship's captain, an indentured servant, and others-from studying their bones.

On July 28, 1996, human bones washed up on the banks of the Columbia River near Kennewick, Washington. Was this an unsolved murder? The remnants of an unmarked grave? What was the story behind this skeleton?