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Seven ye >> we want to figure out what bdc is. >> seven years ago he was working at an investment firm when he began tutoring his little cousin in math. when scheduling time got difficult a friend of kahn's made a suggestion. >> he said why don't you put your lectures on youtube. i said youtube is for dogs on skateboards, not mathematics. >> five years later he has produced 3,000 videos that have been viewed over 80 million times. bill gates is a big fan and donated seed money. the videos cover every level of math. >> you only have a hypotonus when you have a right triangle. it is the side opp...

a country. indeed our democracy depends on an educated citizenry. let's take a look. 100 american kids entering high school, what does fate have in store for them? 25 out of that hundred won't graduate from high school, a total of 50 won't go to college. that's half the class that won't go on to higher education. 50 will attends college, but only 22 will graduate within six years. meanwhile other countries are outsmarting us. on a recent international test, u.s. students ranked only 15th in the world in reading, 15 in science and 31st in math. what's odd is that we have been outstand...