Hamming it up

Well I have been working on studying for my Ham technician license. While I have been studying for the test I have learned some interesting things.

What is the minimum voltage that is usually dangerous to humans? 30 Volts

What does the term "apogee" refer to when applied to an Earth satellite? The most distant point from the Earth in the satellite's orbit.

What is the basic unit of inductance?
The henry