How many lines of symmetry does a heart have?

This word for a bug or malfunction was popularized in the 1962 book into orbit by the mercury astronauts

Me plzzz what is the ratio of water than falls on land as compared to the amount that falls onto the oceans? what role do clouds play in regulating earth’s energy balance? me plzzz

About 140,000 japanese died in this japanese city when americans dropped an atomic bob at the end of world war ii