Trivia!

Why are automobile radiators painted black?

Automobile radiators are painted black because black has the highest coefficient
of emissivity. This means that black radiates heat most effectively of any color.
You may have heard of a black body radiator, the coefficient of emissivity is unrelated
to this phenomena so don’t get confused!

Why shouldn’t you store leftovers in the “tin” can that they came in?

The cans that you purchase your fruit/beans/etc in are actually made of steel which
has been tin plated. The problem is that the steel and tin are electrochemically
active, this means that the tin and steel will exchange electrons, causing rust!
The reason that the cans don’t rust before you get them is that the inside of the
can is oxygen free (otherwise there would be lots of botulism). The reduction reaction on the steel requires
oxygen, so if you pop open your can of fruit and toss the remainder in the fridge,
when you get it back out to finish it you’ll be eating the iron atoms (rust) that
have started to form in solution!

Before you ask, soda cans are also painted on the inside to prevent oxidation from the acids and carbonation present in soda water.