Weird Fantasy #13

After a radioactive comet passes over Earth, the radiation causes every mammal to become sterile. In the future when humanity seems doomed to die off, two elderly scientists try a last ditch effort to save the human race. They plan on sending a time wave back into the past before the coming of the comet and bring humans to the present to procreate. They set up a time field at Grand Central Station and wonder why only men are coming into the future. It turns out the field was set in front of the men's washroom.