There is a single light of science, and to brighten it anywhere is to brighten it everywhere.
A chemical extracted from leeches is used as a painkiller.
A common cure for all kinds of illnesses in the past was ‘bleeding' the patient. This could be done by the doctor making a small cut and putting a hot cup over the wound to suck out blood, or by putting blood-sucking leeches on the skin. Using leeches is being reintroduced by some western doctors.
A cure for whooping cough used in Yorkshire, England in the 1800s was to drink a bowl of soup with nine frogs hidden in it. You couldn't make it yourself – it only worked if you didn't know about the frogs. (And probably not then, either!)
A fear of worms is called scoleciphobia.
A man who experimented with feeding a Venus flytrap – a type of flesh-eating plant – with bits of his own flesh found the plant could digest it easily. He used bits of his toes that had rotted and dropped off as a result of athlete's foot.