Passengers who opt out of the screening receive an alternate form of checking, which includes a pat-down procedure.

CNN: 150 more full-body scanners to go in U.S. airports

Looking for PSA could form the basis of a screening test.

BBC: Prostate cancer linked to mutant gene

The basic techniques of human embryo creation that Dr. Edwards pioneered form the technical foundation of in vitro fertilization, human cloning techniques, genetic screening of human embryos and embryonic-stem-cell research.

WSJ: Test-Tube Baby Pioneer Robert Edwards Wins Nobel Prize for Medicine