This is funny definition of gravitation

GRAVITATION, n. The tendency of all bodies to approach one another with a strength proportion to the quantity of matter they contain - the quantity of matter they contain being ascertained by the strength of their tendency to approach one another. This is a lovely and edifying illustration of how science, having made A the proof of B, makes B the proof of A.

Did you know that...

New Jersey
is home to more scientists and engineers per square mile
than anywhere else in the world.

The most interesting interpretations of an image construction diagram

One needs just two rays to find an image of an object formed by a diverging lens.  Below, there are the most interesting interpretations of constructing the diagram. I admire creativity expressed in these works.