What does a joyful person look like?

It's to know your purpose before you read something because a purpose can:

Determine the meaning of the word *propel* using the context clues in the sentence. wind power is the ability to capture the wind in a way to *propel* the blades of wind turbines. a) to move slowly b) to urge onward c) to stop from moving d) to drive, or cause to move, forward

How does the yellow fever altered history