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Comparable, but unique version of the s.a.t., so there's no benefit of looking at your neighbor, either. >> comparable, but unique. i don't know what that means. >> it tests the same core skills in math, reading, and writing, so it does it with different questions. it's the same math skill you and i are going to get, but mine has the numbers 4, 11, and 17, and yours has the numbers 16, 23, 2. >> so if i leaned over and saw that you were choosing "a," "b," "c," "d," that doesn't help me, because i have different questions. >> not at all. >> that is not good for a high school cheater. in the las...

Whiz. and decided to use his math skill his in casinos. >> he started going to atlantic city. and card counting. and he did it until they kicked him out. it was a challenge. it was not for the money. it was the idea of being able to use your mind to create profitably. >> eventually, john would become a trader at the philadelphia stock exchange and work with and mentor pete delici. >> john did everything to an extreme. so if he believed in something or he felt that mathematically he had an edge, he would exploit that as big as he could. >> part of john's strategy was to have competitors on the ...

>> that very first meeting, ann tells john that she is bipolar. >> and he started telling me about his issues with mental illness in his own family and we started to talk about that. >> and about his own history with depression, which his parents say started at a young age. >> john would get depressed. not unfrequently. >> he would go through times of everything is going wrong, usually it got over quickly. >> they say that young john enjoyed nature, animals and. >> he got into minerals, almost immediately he saw in the minerals something that he could create and kind of make a profit on. >> jo...

The department of toxic substances control, didn't know there was such a department, says the chemicals were found in 25 different brands stocked mostly by california nail salons and get this, 10 out of the 12 bottles that tested positive were advertised as toxin free. the agency says women who work in salons are most at risk. >> high school girls may not be at the head of the class for math because of teacher bias. according to researchers at the university of texas at austin, teachers rate the math skill of girls as being lower than boys. even if that isn't true, it might not be something th...