. >> freedom of the press, i should just mentioned, basson originally called it freedom of the use of the press and is indeed the freedom to press and publish things. it is not what we refer to institutionally as the press. >> every saturday at 8:00 p.m. eastern, lectures history also available as a podcast. find it where you listen to podcasts. >> we are presently in the office of the chief medical examiner for the state of mariner -- of maryland. these are unexplained deaths, which remade in the 1940's between 1943 and 1948. they're made by the mother of forensic science. she is the only woman to make a major contribution to the field of forensic science. what she did was absently revolutionize everything. everything we have come to now in a csi type crime scene investigation, with or in popular culture and television and movies or in real life, is all due to her and what she did at harvard university. >> they are all based on real cases. she said the facts are true. everything you see depicted actually happens. although not necessarily in the same scene. they are intentionally ambi