When I was in elementary school, science class included making fun of "old wives tales" as emblematic of superstition.

There was an "old wives tale" that moldy bread could cure a fever.

If only those early scientists had been more curious and less dismissive, we might have had penicillin much much sooner.

Of course, then we would have had penicillin resistant bugs much sooner, too...

Old Wives Tale -- eating moldy bread could cure a fever.

Sometimes the mold was penicillin.

One wonders if Fleming had heard of this tale....

Rough translation of part of the lyrics:

Cik pogodi sta imam za veceru,

Hey guess what I have for dinner,

Budjav lebac, budjav lebac.

Moldy bread, moldy bread,

Njam njam njam njam...

Yum yum yum yum.