From The Physics of Gravity, Buoyancy and Flight to A Jet Train that Skies at the Speed of an Airplanes, as told by Harvey, a Brilliant Cane

PG is getting on in years, and he bought a brilliant,

cherrywood cane to help him walk. PG named the cane

Harvy, and the two became great companions. The special

thing about Harvy is that he can talk. He has the

inquisitive mind and vivid imagination of a child and a

special curiosity about science.

The story begins at JFK airport where Harvy is entranced

by escalators, and he wonders where the moving stairs

go once the basement fills up. Harvy also wonders

about the origins of this mystical force called gravity.

He's fascinated by the laws of buoyancy, flotation, and the

wonders of flight. Why don't airplanes have to flap their

wings like birds fly? Why can humming birds hover without

having rotating blades like a helicopter?