Humans have harmlessly harvested coral reefs for thousands—or even hundreds of thousands—of years. So why has our behavior in recent years suddenly put reefs at risk?
In a single century, the salmon population of Washington State's Elwha River shrunk by more than 99 percent. What caused this dramatic decline, and what can be done to turn it around?
Meet the little dinosaurs of Ghost Ranch. Investigate evolution and the loss of flight in dinosaurs and birds. And dig deep into the lives of dinosaurs with these recommended reads.
How much can you reduce your carbon dioxide emissions? Is it worth it? Learn how simple choices multiplied by everyone in your community can make a big difference.
Watch how a unique dual-satellite mission called GRACE-NASA's Gravity and
Climate Experiment-is revealing an unprecedented view of our water planet.
For background information, educational resources and more, visit Grace:
Tracking Water from Space on the Science Bulletins website,
Science Bulletins is a production of the National Center for Science
Literacy, Education, and Technology (NCSLET), part of the Department of
Education at the American Museum of Natural History. This visualization
was supported by the National Oceanic and Atmospheric Administration
Two teams working independently in 1998 came to the same conclusion: An invisible force, one that seems to act opposite gravity, is separating the matter in space at an increasing pace. Find out more about their “jaw-dropping” discovery.
If LIGO regularly registers gravitational waves, it will more than vindicate Einstein. The observatory may help answer pressing questions about the cosmos’s biggest mysteries, among them black holes, dark matter, and the Big Bang.
Anything with an accelerating mass has a gravitational effect — an atomic bomb, a spinning aircraft carrier, even you. Learn more about these ripples in space and how LIGO is designed to capture the biggest gravitational waves.
LIGO, or the Laser Interferometer Gravitational-wave Observatory, is just one of five large-scale gravitational-wave detectors in the world. Find out how they rely on each other to achieve their goals.