Fun question thread

[Fin]

Ok, this may work out great or may be a catastrophe, but let's try.

Post a question here--whatever type you like. Math problem, science question, history reference, etc.

Then find the other thread I started here called "Fun answer thread."

Most discussion will take place on that thread. Why two different threads? So the suprise won't be ruined by happening to glance down.

First question:

What volume of blood does the human body contain?

(seek your answer on the "fun answer thread." Otherwise--post another fun question below)

[Fin]

Ok, so we're off to a slow start. S'Ok, I'll ask the second question, too:

Which city is geographically farther west: San Diego, CA or Reno, NV?

[Fin]

It's a mistake to hire amateurs, as the archaeologist found to his great distress. One of his new staff came running in one day, all excited. He had just paid a local a great deal of money for an extremely valuable coin. As he said, "I've never seen one like this before, and I've been looking in museums for thirty years. It's a genuine Egyptian coin marked 100 B.C. - solid gold!" The director of the expedition sighed wearily and fired him. Why?

[Fin]

Which is heavier, hydrogen or helium?