Sujet: hour glasses liste de sujets
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	Nine minutes		2004-09-02
		A student pose la question : You have two hour glasses-one measures 7 minutes and one measures 4 minutes.How can you time 9 minutes? Penny Nom lui répond.
	Timing with hour glasses		2001-03-20
		Nathan pose la question : How can a chef use an 11 minute hour glass and a seven minute hour glass to time a vegtable that needs to be steamed for 15 minutes. Leeanne Boehm lui répond.

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