William Ackman: Everything You Need to Know About Finance and Investing in Under an Hour
Mr. Ackman, famous hedge fund manager, gives a condense lecture of about 40 minutes on the subject. If you are a newcomer to investing / speculating in the stock market, it is probably a good idea to watch this video completely.
In case you do not know who Mr. Ackman is, you can read about him at Wikipedia.