AJ stands for Andrew Jackson, our 7th president. His reputation for toughness earned him the nickname "Old Hickory." A hero of the War of 1812, Jackson has appeared on the $20 bill since 1928.

Sharpen your math skills with MathBrain.

Prime numbers, ratios, formulas...it's math! Whether you're good it or not, some day you might see yourself using it in ways you never dreamed of.

Like Spaceday 2011, where more than 300 kids in New York learned about the importance of math and science while they checked out telescopes, planets and even went on a 3-D space tour.

Who knew math could be so cool!

Unusual math careers

Military math disasters. Military Math Disasters

During the Gulf War in 1991, an Iraqi scud missile killed 28 American soldiers when it hit an Army barracks.

A US Patriot missile should have intercepted it. The investigation found that a mistake in multiplication of fractions and decimals caused the error.

The Patriot missed the scud by .34 seconds.

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During World War II, code-breakers were vital to the US military. They chose men and women who were good at math and language.

The military isn't the only career that uses math. Consider these unusual careers...

TCU What makes credit unions so great? Members like you. Every dollar you invest in your credit union earns you money while other members borrow it. When you're ready for a loan, other members' savings will be there to help you out at the lowest possible cost.