Greetings all. I have more questions...

1)... How does one visually know the difference between half hollow ground razors, full hollow and extra hollow grinds?

2)... What are the shaving characteristics/differences between these grinds?

3)... Are they all honed and stropped in the same manner?

4)... How do astronauts clean their razors, in zero gravity, without blobs of water and lather floating all around the ship?