Mad dogs and Englishmen

I'm reminded of the phrase "Only mad dogs and Englishmen go out in the mid-day sun" in this warm weather we've been having.
Though the English who colonized the tropic regions did suffer a bit at first, they soon learned a practice to keep cool "in the mid-day sun".

To put this in an engineering paradigm, suppose your house has an automatic central heating/cooling system whereby the heating turns on when the thermostat registers 60 or below; and the airconditioner kicks on when the temperature in the house reaches 80 or above.
Now suppose further that on a hot day, let's say 85 degrees out, you bring a huge block of ice into your house, nearby the thermostat. What happens? Well the ice block cools the air in the room, and if it's large enough, the temperature will drop to say 59 degrees; the furnace kicks on, driving up the temperature in the other parts of the house.
Suppose you put a small wood stove in that same room, and fire it up. What happens? The temperature in the room is now perhaps 90 degrees, and the air conditioner kicks into high gear, cooling the whole house even more than it would had you not fired up the stove.

So it is with your body; your body has an automatic heating/cooling system, responding to the temperature inside it. Given the response to a large influx of a cold substance in the previous example, what do you suppose happens when you drink a lot of ice cold beverages on a hot day? Your heating system kicks on, raising your internal temperature even more.
What happens if you drink something hot, such as tea? Your cooling system kicks into high gear, cooling you more than it had been.

The Englishmen learned from the natives to drink hot tea in the mid-day sun, and survived to extend their realm to where the sun never set on the British Empire.