Test You "Caffeine IQ"!

Think you're caffeine savvy? Take this short quiz and find out your Caffeine IQ!

Which substance in the brain, which causes drowsiness, is blocked by caffeine, producing its stimulating effect?
How many plants contain caffeine?
Which country produces the world's most coffee?
Where was tea first brewed as a beverage?
After water, which beverage is the world's most widely consumed?
In what decade was cola first introduced?
What percentage of Americans say they consume caffeine daily?
TRUE or FALSE: Energy drinks contain more caffeine than a typical cup of coffee.
People of which ethnic derivation are believed to have greater sensitivity to caffeine?
Which country consumes the most coffee in the world (per person)?