A student's science joke

[FloridaJudy]

57. Noah is having problems with two venomous snakes

On the ark. They insist on chasing and hissing at the other animals, and have even bitten a few, though fortunately not yet fatally. He decides the only thing to do is isolate the ill-tempered reptiles. Since snakes are notoriously able to slither through small cracks, he decides that locking them in a room wouldn't work.

So he saws the legs off of a small table, nails some rough-hewn timber to the bottom, puts the snakes on the makeshift raft, and attaches it to the ark with a slender rope. Then he sets it adrift.

The next morning, he looks out to check on the snakes and - behold! - during the night, they have reproduced. They are now surrounded with a dozen baby snakes, all hissing and looking for something to bite.

Noah had forgotten that adders can multiply on a log table.