Note that different people have different research approaches. The two old ladies check that none of them can see herself and the problem is solved! ;-)
The other older lady makes an experiment with motion and rigorously determines that she is ... well ... unsichtbar. :-)
Throwback Thursday: Discovering the Earth from Space (Synopsis) - “We came all this way to explore the Moon, and the most important thing is that we discovered the Earth.” -Bill Anders, Apollo 8 astronaut When you think a...
2 hours ago