Fifty miles. That's about the distance separating the United States and Russia. And it's the answer to today's Geo Quiz. The World's David Leveille takes a look at an old proposal to link Siberia and mainland Alaska by tunnel.
A series of doping scandals involving Russian athletes has led to calls for an outright ban against the entire Russian Olympic squad. Now Russian athletes are waiting to find out whether they're going to have to sit this one out.