Riddle of the Day

[Gizmokid2005]

There was a green house. Inside the green house was a white house. Inside the white house was a red house. Inside the red house there were lots of babies. What am I?

ANSWER (Congrats Cauzomb): A Watermelon.

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NEXT RIDDLE (Sorry about the delay, it's been one of those mondays):

I build up castles.
I tear down mountains.
I make some men blind,
I help others to see.
What am I?