Weekly Giveaway Puzzle : TI89 MATH APP

WEEKLY GIVEAWAY PUZZLE to win a FREE TI 89 MATH APP OF YOUR CHOICE!!
Ahead of a big celebration, a king receives a delivery of 1,000 bottles of beer.
But there is a slight problem: one of the bottles has been poisoned.
The bad beer is indistinguishable in every way, except that it causes food poisoning about one hour after ingested.
The king is short on time and bodies.
The party is in a few hours and he only has 10 guards to spare.

How can the king identify the bad bottle?

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