. >> bpa is of concern, becausese it looks likeke an esestrogen. and itit's been n to have a weak estrogenenic effect. and soso if you'rere exd to a chemicacal that might inttfere with h your hormone levels, in this case your estrogen, that can have effects, particularly if itit happens during development. >> and there is preliminary data that says that it may in fact directly--an early life exposure might directly increasase the risk of breast cancer in animals. >> ifif there are chemicals that affect the development of the breast t even before birth, if thehere are chemicals that cause breast tumors in animals, these are chemicals that we want to be worriried abt and start thinking about reducing exposure. >>>> in addition to breast canc, bpa may bebe associated with genetic c damage and a wide vavariety of reprproductive, metabolic, behaviorral, and developmental p problems. it's one of the top industrial chemicals in the world. about 6 billion pounds of bpa are produced globally each year, earning manufacturers a profit of some $8 billion. >> w

they also use this in depth investigations and the bpa, bloodstain pattern analysis, 1885, the first scientific papers focused on how blood quite relates, how it dries, whether arterial blood is brighter and the spotter analysis. what kind of motion produces what kind of results in the blood staining on the wall. fingerprints, going back, systematized at the beginning of the 20th century. these design ancient contracts where you stick your thumb in the tablet, then it is chiseled into, even in the 1200s they did fingerprints, they were used in depth investigations. but it didn't come immediately to the united states until after 1902, there was a famous case which a guy is murdered in his apartment and he touched a glass cabinet door and he leaves a partial print on one of the shards so they can brew because it's a partial that it was left after the glass was broken, not there before. he only put his finger on part of it and it's the first case, 1902 in france really convict on fingerprint analysis. juries were slow to accept it, they never thought about a fingerprint but it moves to