A noted biologist, who had been studying little green frogs in a swamp, was stumped.

The frog population, despite efforts at predator control, was declining at an alarming rate.

A chemist at a nearby college came up with a solution:

The frogs, due to a chemical change in the swamp water, simply couldn't stay coupled long enough to reproduce successfully.

The chemist then brewed up a new adhesive to assist the frogs' together, which included one part sodium.

It seems the little green frogs needed some monosodium glue to mate.