Editor's note: This recap was last published on Dec. 28, 2009. NEW YORK ( TheStreet) -- "You can never afford to stop learning," Jim Cramer told the viewers of his "Mad Money" TV show Friday. He said that even Wall Street veterans don't know everything, and unless investors keep learning, the markets will run circles around them. That's why he unveiled new rules for investing in turbulent markets. Rule No 1: A bear market rally is still a rally. Cramer said this rule should be obvious, but conventional market wisdom still seems to think that a bear market rally is not worth profiting from.