In the center,at ground level, is a round pool of water.

VOA: special.2009.05.25

That means they're college eligible. So part of the reason college enrollments are at an all-time high is because the pool of youth that's eligible to go to college is also at an all-time high."

VOA: special.2009.11.19

"The implications are obvious. The developing world has,by far, the largest pool of people at risk for severe and fatal H1N1 infections."

VOA: standard.2009.05.18