Why does a horse eat grass backward and a cow forward?
Why does a hop vine wind one way and a bean vine the other?
Where should a chimney be the larger, at the top or bottom, and why?
Can you tell why a horse, when tethered with a rope, always unravels it, while a cow always twists it into kinky knots?
How old must a grape vine be before it bears?
Can you tell why leaves turn upside down before it rains?
What wood will bear the greatest weight without breaking? Which is the most elastic?
What is the length of a horse’s head—is it as long as a flour barrel?
What animals have no upper teeth in front, and why?