Quacks

Any society not enlightened by philosophers is fooled by quacks.

The cow moos, the rooster crows, the pig oinks, the duck quacks, and the cat meows.

If it looks like a duck, swims like a duck, and quacks like a duck, then it probably is a duck.

If it looks like a duck and quacks like a duck, then it's probably not a squirrel.

The duck quacks.

Holistic medicine is largely unregulated so has a greater share of quacks.

The duck quacks 'quack quack'.

In "A Journal of the Plague Year," a 1772 fictionalized account of London's Great Plague of 1665, Daniel Defoe notes that people were quick to turn to quacks and peddlers offering "Sovereign cordials against the corruption of the air."

A duck quacks.

If it looks like a duck, swims like a duck, and quacks like a duck, then it's probably a duck.