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Many coral reefs are dying. This one is exploding with life.
Once a year‚ after dark‚ a bit of magic happens in the ocean.
In tropical waters worldwide‚ large chunks of coral — those colorful rocklike structures in shallow‚ coastal waters‚ each a colony of living animals — start puffing out hundreds of little pearl-sized balls. Some are pink. Others are red‚ orange‚ or yellow. For a few minutes‚ the ocean is a snow globe‚ and then the balls float away.
This phenomenon‚ known as spawning‚ is how many corals reproduce. Each ball is a bundle of...