There are a few isolated areas in New England (Vermont anyway) where apparently it was not uncommon up into the mid-20th century to find some possibly inadvertent inbreeding. Probably discovered via higher than expected rates of developmental delay or such, that first drew attention of educators or social caseworkers. But I had heard there were some instances of multiple stillbirths that indicated deadly recombination of recessive genes for fatal missteps in prenatal development. Whoever said ignorance is bliss was at least sometimes not correct... I'm trying to remember where I ran into that info, it may have been was while I was taking some courses at the New School in NYC.
On the car thing: I only drive a stick now and have only ever owned them. I always get a bit freaked out whenever I have to rent a car and it's an automatic; it takes me at least three or four stops (or hills, or approaches to curves) to quit looking for the clutch pedal.
Being able to shift down and keep moving around someone ahead of me who loses nerve and takes foot off gas approaching a snowy hillcrest has saved me more than once. I'd always stop at the village just past the downslope and tell the local deputy "There's guys in the ditch up top..." but I never dared to stop on the hill or I'd have been in the ditch along with them.
How I learned to drive a stick was on a hilly bunch of back roads with zero traffic except for a hay wagon once in awhile in summer. Best way! You have to be able to resume forward progress without stalling, skidding or sliding back and freaking out the guy behind you. This you do not want to learn while on, say, the ramp to the George Washington Bridge.
When I first started driving manual I used to sweat being stopped on a hill, especially driving a car with a low idling speed. The prospect of getting my foot from brake to the gas, while letting the clutch out an appropriate amount was terrifying. Until I became competent, I mastered keeping my foot on both the brake and gas to get the idle speed up a bit (for a certain car) anticipating the transisition from stopped to moving on a hill.