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From Beijing to Boston, chicken pox has plagued millions of children and adults. See how chicken pox works.

Migraines affect the lives of between 12 and 24 million Americans. Find out why migraines are so greatly underdiagnosed.

A hypoallergenic cat may be the answer for millions of cat lovers that are allergic to cats. Find out how hypoallergenic cats are created.

Millions of players have heard the message that of all the casino games, blackjack is the one that it is possible to beat. Learn to play blackjack.

Fourteen countries and 39 million square miles make up Oceania in the South Pacific. And bungee jumping was invented there, too.

Food recalls, whether voluntary or not, cost companies millions. Read our list of the top 10 costliest food recalls.

Every April 22, millions of people around the world gather to celebrate Earth Day. Who started Earth Day and when?

HIV continues to be a major global public health issue, having claimed more than 35 million lives so far.

Public schools educate about 50 million students a year. A look at costs, challenges, magnet and charter schools and teacher quality.

Colorblindness affects around 300 million people worldwide. HowStuffWorks explains what it is and how glasses can help.

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