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What is ‘too much’ caffeine?

Carl Azuz reports on why consuming too much caffeine is not good for you. It’s not just the internet that runs on Java.MORE

What is the plague?

What is the plague?

CNN’s Elizabeth Cohen explains the history of the plague and the reason it’s still around today.MORE

Searching for alien life in Mars photos

Searching for alien life in Mars photos

From Martian rats to mysterious women, alien hunters say the photos from the Mars rover prove there’s life on the red planet. CNN’s Ian Lee investigates.MORE

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