Scientists at the National Institute of Standards and Technology, or NIST, are developing atomic clocks that are so accurate that the effects of the general theory of relativity come into play. That means if two of these clocks are at slightly different elevations—even a few centimeters—the higher clock runs noticeably faster. In this episode, find out why this is a problem for NIST, how the National Geodetic Survey helped to solve this problem, and how these amazing atomic clocks may someday play an important role in the science of geodesy.

What does it mean when a coral bleaches? Hear from NOAA's Jennifer Koss and Mark Eakin on the effects of coral bleaching in our latest Ocean Shorts audio podcast.

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In this episode, hear about a condition known as hypoxia -- where oxygen levels drop so low that creatures in the water are stressed or killed.

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Join us for an interview with oceanographer Tim Battista about mapping coral reef ecosystems in the U.S. Caribbean.