Cosmonaut Alexei Leonov remembered the Soviet ... Following the troubles of Apollo 13, Apollo 18 and 19 were scrubbed as well. Twelve American men are the only humans to walk on the surface ...

"We talk to our Russian friends now and the cosmonauts. They admit now that Apollo 8 was really a blow to their psyche, I guess, a blow to their prestige that we were able to go around the moon ...