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From: whp@cbnap.UUCP
Newsgroups: net.physics
Subject: heating and cooling
Message-ID: <143@cbnap.UUCP>
Date: Mon, 16-Jan-84 08:04:58 EST
Article-I.D.: cbnap.143
Posted: Mon Jan 16 08:04:58 1984
Date-Received: Wed, 18-Jan-84 01:16:39 EST
Lines: 10

There is an old physics puzzle I recently came accross again, only
now I'm not so sure of the answer.  It goes like this:

You have just poured yourself a hot cup of coffee.  As you are
about to pour in some milk, the door-bell rings.  To keep the
coffee hottest longest, do you add the milk immediately or
should you add the milk later (just before you drink)?

If the milk was kept cool in the refrigerator before the door-bell
rang, is the answer affected?