DIAGNOSIS OF PREGNANCY PRIOR TO 1960:
1. Obtain urine sample from patient.
2. Inject urine into female rabbit.
3. Wait 48 hours.
4. Kill rabbit.
5. Examine rabbit ovaries. If enlarged/abnormal due to hCG, woman is pregnant.
6. Call husband with result. (Sad but true. See Mad Men for excellent depiction of this practice).
The phrase "the rabbit died" became a euphemism for pregnancy.
There's a line in the Aerosmith song Sweet Emotion about this: "You can't catch me cuz the rabbit done died, yes it did!"
Med students may hate learning PV loops of the heart, but no one hates them more than the dogs of Baltimore in the 1970s.
These graphs were originally created using data from canine hearts at Johns Hopkins in the early 70s. Dogs were anesthetized, the RV was bypassed, and preload and afterload were manipulated. In later experiments, researchers actually removed the heart and kept it functioning with blood supplied by another dog!
So if you live in Maryland, be extra careful walking your dog in East Baltimore.