Dan is very fast. We couldn't have done this study without him.

236

I think it's important. Scientifically, it's a mystery. That's as good as it gets.

194

For me, it all comes down to the determination of the critter. It's a matter of environment.

155

What mountaineers would consider climbing routes, they use all the time.

149

They are undaunted by time and space.

64