How do you feel about “l8r” for “later”?

If you care about books, you should know the story of Johannes Gutenberg.

Learn the first part of a memory trick that will help you turn numbers into mental pictures so that you can remember them forever. Then try your hand at a few practice problems before learning the second half of the technique in the next article.

Learn what negative exponents and an exponent of zero mean. Try your new skills with a few patented Math Dude practice problems.

President Obama set off a political firestorm by asserting his power to appoint high-level officials while the Senate is in recess. Get a legal expert’s take on the constitutional issues behind this controversy.