No, you can't get HIV from sweat and bumping heads.
The term means playing one on one against the dealer, no other players involved.
Heads have a person on it. Tails have something else on it.
1
The meaning of "heads up" is to watch out. For example if i threw a baseball at your face, to give you a warning i would say "heads up". or if you are playing catch
Yes
The person who heads or direct the orchestra\ band is called as "Conductor" or "Maestro".
the three-point line the three-point line
the president
Not likely.
an anbassador
an anbassador
The size of the bolts used for basketball rims will depend on the manufacturer. Some of the bolts may be half inch heads and some may be a metric measure of 9mm to 11mm.