How Do Metal Detectors Work?

In a metal like copper, however, the outer electrons swim around freely and are shared by all the atoms. That’s why ...
Space on MSN

Dark matter obeys gravity after all — could that rule out a 5th fundamental force in the universe?

Scientists have discovered that dark matter, the universe's most mysterious "stuff," obeys gravity on vast cosmological scales. This could help to dismiss the possibility of a fifth fundamental force ...

With more Moon missions on the horizon, avoiding crowding and collisions will be a growing challenge

The US doesn’t currently have much ability to monitor what’s going on in the space around the Moon. An effort by the Air ...
Cfr.org

International Affairs Fellowship

The IAF program has more than 550 alumni who constitute a who’s who of the U.S. foreign policy community, including a former secretary, several undersecretaries of state, and ambassadors. Applicants ...