Jim Finn, the noted biologist, was stumped. He'd spent months studying the little green frogs in the Keefo swamp. The population, despite all efforts at predator control, was declining at an alarming rate.
Finally, Finn went to the chemistry department at his college to see if anyone there might be able to help. Tom Trom looked into the problem, and came up with a solution. The little frogs had succumbed to a chemical change in the swamp's water, and simply couldn't stay coupled long enough to reproduce. Tom brewed up a new adhesive, made from a dash of this, a zoss of that, and most critically, one part sodium.
"You mean?.... " Jim said when told.
"Yes," said Tom, "They needed mono-sodium glue to mate."