If you don't indicate to whom the check goes to, nobody can receive the money. (Unless the check was blank, then anybody could receive the money)
The size and shape have no effect on density of matter because the size and shape of the particles stay the same no matter what.
Brushing your teeth because you are cleaned your mouth
adrenal glands are used for the fight and flight responses.
Your voltmeter and your teacher are both right, but the water analogy of electricity can only go so far. One big drawback is that, unlike with water, there is no absolute voltage. .... Wherever you put the black lead is defined as "0V". .... flowing (i.e. the circuit is broken) you will not get this change in voltage.
