Many, Multiple and Myriad

In writing, people tend to hunt for $10 words when the nickel version works. "Many" is just one of those words. Like an old sweater, reach for it when you need it. Often, in an attempt to sound more serious or professorial, people will use "multiple." It's fine, but I'm not crazy about it. It reminds me of math class.
Then there are times when writers drop back in the pocket, look down field and go for the long bomb: "Myriad."
It's a good word, although it can sound a little pompous, but, hey, sometimes it's good to thrown down like that. It's almost always misused in a sentence: "...the result of a myriad of factors."
That's essentially saying "it's the result of a lot of a lot factors."
Proper grammar, for instance as an adjective, would be "There are myriad reasons the Giants will lose 100 games this season, but we can start with the starting nine."

It's a noun and an adjective meaning a very great or indefinitely great number of things. It's from the Latin myria, meaning 10,000.

Onward...

A couple of recent updates to the AP Stylebook online:

Asian-American

A person of Asian birth or descent who lives in the U.S. When possible, refer to a person's country of origin. For example: Filipino-American or Indian-American. Follow the person's preference. See nationalities and race, and race entries.

heart attack, heart failure, cardiac arrest

A heart attack (myocardial infarction) occurs when one or more arteries supplying blood to the heart becomes blocked. Heart failure is a chronic condition that occurs when a weakened heart can no longer effectively pump blood. Cardiac arrest, or sudden cardiac arrest, occurs when the heart suddenly stops beating. It can be due to a heart attack, a heart rhythm problem, or as a result of electrocution or other trauma.