The four fundamental forces sounds like a rap group from the 70s. No one ever knows. The next most familiar force to us humans is the electromagnetic force. That's what makes magnets repel and stick. Another force is the weak nuclear force. And another force is the force within the nucleus of the atom that holds particles together like protons hold them together.
The pull of gravity (the force, not the movie) is irresistible as Neil deGrasse Tyson and Leighann Lord grapple with weighty fan questions about matter and the curvature of spacetime.
Read more and listen to the full episode at http://www.startalkradio.net/show/cosmic-queries-gravity/
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