What mathematical rule is represented by the rebus below?

.1km. = ~
.1cm. = ~
.1mm. = ____

Two friends, Joe and Smoe, were born in May, one in 1932, the other a year later. Each had an antique grandfather clock of which he was extremely proud. Both of the clocks worked fairly well considering their age, but one clock gained ten seconds per hour while the other one lost ten seconds per hour. On a day in January, the two friends set both clocks correctly at 12:00 noon. "Do you realize," asked Joe, "that the next time both of our ...

Everyone knows that both Christmas Day and New Year's Day always fall on the same day of the week. However, in 1939, the year of the outbreak of World War II, Christmas fell on a Monday and New Year's fell on a Sunday. Why?

Eve, Rob, Hannah, and Otto were walking down a dusty road. Otto told Rob, "You don't belong with us." Why did Otto make such a statement?

What animal comes next in this sequence:

GORILLA
HEDGEHOG
CAMEL
MOUSE
FOX
BEAR
MOLE
==?==

Choose from: PORCUPINE BADGER COW GIRAFFE SQUIRREL RHINOCEROS

I am a famous author
I am a famous poet
Credit for my work
It is not mine
Wouldn't ya know it
For all that is done
I get a lot a of credit
You all have heard my name,
But only some remember