Two actually:
1) Did you know that between your veins, arteries, and capilaries you have about 60,000 miles worth of path for your blood to pump through? That's almost 2 and a half times around the entire earth. No wonder your heart works so hard. It sure encourages me to do what I can to make my heart's job easier. . .
2) Your body turns on and off the capilaries (the smallest passageway for blood, many times only large enough for 1 blood cell to pass through at a time). Meaning they they will pass blood for a minute or two and then shut down for a minute or two and then start up again. This has to do with the same idea. Can you imagine how much work it would be for your heart to try to pump blood through all 60,000 miles at the same time?!
And just another fun fact for those of you who are old enough to remember them. The band "They Might Be Giants" has begun doing educational songs. Here are two that you might recognize:
http://www.dave-logan.com/animation/bloodmobile/
and
http://www.rhapsody.com/goto?rcid=tra.11860346&artistId=art.5081
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