Murray Carpenter, a journalist who lives in Belfast, talks about the world's most-used drug in his latest book, "Caffeinated: How our daily habit helps, hurts, and hooks us." 207

It's a drug that millions of the people use every day. Caffeine - which we most often associate with coffee - is found in a number of drinks. It helps with alertness and can affect mood. Murray Carpenter, a journalist from the town of Belfast, tracked caffeine across the globe and found some surprising facts and uses.

Check out: Murray Carpenter's Website

Caffeinated has: a Facebook page

Find the book: on Amazon

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