Kids who grow up in radically different environments are always going to have different comfort levels with regard to a topic. If you don't live near a train track, it's hard to squash a penny that way, and if you live in an apartment in New York City, it may be difficult to get to drive a car.
The news media is so quick to pick up tragic stories of imperiled children that it seems like there are more terrible events today than ever before - when in fact it's quite the opposite. It is, in all manners possible to calculate, the safest time in the history of civilization to be a kid.
We put suffocation warnings on all the - on every piece of plastic film manufactured in the United States or for sale with an item in the United States. We put warnings on coffee cups to tell us that the contents may be hot. And we seem to think that any item sharper than a golf ball is too sharp for children under the age of 10.