Trails need to be reconstructed. Please avoid building trails that go uphill.
Thus the metric system did not really catch on in the States, unless you count the increasing popularity of the nine-millimeter bullet.
Eventually everyone has to die, except Elvis.
The real threat to whales is whaling, which has endangered many whale species.
Babies and Other Hazards of Sex: How to Make a Tiny Person in Only 9 Months, with Tools You Probably Have around the Home.
You don't have to think really hard to get the joke. I think humor in general appeals to all people.