Animals and nature
Rainforests are Earth's lungs.
Sports
You strike the right side of the ball. Which way does it curve?
Physics
Einstein proved time passes at the same rate everywhere.
Sports
You're six weeks into training. The 8-mile run that wrecked you in week one now feels manageable. What changed most inside your leg muscles?
Music
A sad chord needs at least four different notes.
Money and finance
You earn twice as much as your friend. Why does the lender reject you?
Sports