245 00|a ScienceNOW. |n Season two, |n part five.

260 __|a Arlington, VA : |b PBS, |c 2007.

500 __|a Copyright permission expires 07/24/08.

500 __|a Title from web site description.

511 0_|a Host, Neil deGrasse Tyson.

520 __|a Renowned astrophysicist Neil deGrasse Tyson hosts this fourth installment of the fast-paced and provocative science newsmagazine, now in its second season on PBS. This episode includes:
Epigenetics - It seems the environment in which we live makes small chemical changes to our DNA without affecting our genes' overall makeup. Experiences may trigger these switches and turn genes on or off. These subtle changes can then be "remembered" and passed on from generation to generation, altering inherited traits. NOVA explores this new idea, interviewing top scientists in the field and following what could be a shift in the way we think about inheritance and our genes.
Kryptos - A strange sculpture resides on the CIA campus in an area that only CIA agents are allowed to roam. Code-breakers have been obsessed with cracking the complex, alphanumeric code incorporated in the monument. The parts already decoded are mystifying: an allusion to the discovery of King Tut's tomb; a poem; and a reference to something buried on CIA grounds. It is said that only the director of the CIA and the artist himself know the meaning of Kryptos. Which code-breaker will be the first to share this knowledge?
T-Rex - Mary Schweitzer, who entered the field of paleontology as a middle-aged housewife, has questioned the science every step of the way. As a graduate student, she found what looked like red blood cells in a dinosaur bone, except that every paleontologist knew that was impossible and promptly attacked her work. Last March, Schweitzer announced the discovery of soft, spongy tissue from a 68-million-year-old Tyrannosaurus rex and is about to show that what science thinks is impossible sometimes turns out to be quite possible.
Arlie Petters profile - Arlie Petters, a native of Belize, holds a joint appointment in the math and physics departments at Duke University, where he studies optical lensing - using light as a metric to understand how gravity behaves in the universe. He developed the mathematical tools to research dark matter, black holes and the age of the universe and will test a new five-dimensional "braneworld" theory of gravity that competes with Einstein's Theory of Relativity, which has four dimensions. 60 minutes.

521 __|a Middle school to adult.

546 __|a Closed captioned for the hearing impaired.

600 14|a Schweitzer, Mary H.

600 10|a Petters, Arlie, |d 1964-

610 10|a United States. |b Central Intelligence Agency |x Buildings

650 _2|a Epigenetics.

650 _0|a Paleontology.

650 _0|a Sculpture, American |z Virginia |z Langley.

650 _0|a Cryptography.

700 1_|a Tyson, Neil deGrasse

710 2_|a WGBH (Television station : Boston, Mass.)

710 2_|a PBS

730 0_|a Nova (Television program)

856 42|a http://www.pbs.org/wgbh/nova/sciencenow/watch/comi-070724.html