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To: 21twelve

And the glass at all of these zoos has been around a long time - why are others just starting to worry about them breaking now?

Global warming weakens the glass.

12 posted on 05/04/2012 9:30:59 PM PDT by Oztrich Boy (This world is a comedy to those that think, a tragedy to those that feel - Horace Walpole)

To: Oztrich Boy

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13 posted on 05/04/2012 9:55:13 PM PDT by publius911 (Formerly Publius 6961, formerly jennsdad)

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