(For the latest Human Nature columns on anal sex, fetal pain, and animal rights, click here.)
Researchers put a human chromosome in mice. The idea is to study causes and treatments of Down's syndrome, which is caused by an extra copy of this chromosome. The chromosome was fused into mouse stem cells, which were then reinserted in mouse embryos, which in turn were implanted in their mothers and brought to term.
People who need organs are using the Internet to recruit donors. They're using Web sites (HelpMyGrandpa.com, MichaelNeedsALiver.com), chat rooms, and e-mail to circumvent the nonprofit organization that allocates organs from cadavers. Supporters say it's efficient; critics say it will help rich and clever people get all the organs.
Scientists are trying to find genetic causes of bulimia and anorexia. They think this is possible because the disorders run in families. The research involves looking for genetic patterns in patients who have "core" traits such as perfectionism, anxiety, and preoccupation with mistakes.
Chevron and a California town will try to fuel a sewage plant with cooking grease from nearby restaurants. The idea is to cut energy costs and ease the burden on landfills.
Mars is experiencing global warming. Its southern polar cap is shrinking at a rate of 10 feet per Martian year. Scientists don't know why, but industrial pollution can be ruled out.
American spending on medical research has doubled. More than half the roughly $100 billion we spend annually comes from the private sector; a quarter comes from government. Pessimists say all this money isn't curing diseases fast enough. Optimists say we've forgotten the diseases we've cured.
NASA will spend more than $100 billion to return to the moon. The plan has three stages: earth orbit, then moon orbit, then descent to the moon. The idea is to set up permanent moon bases to develop technologies for missions to Mars and beyond.
Finalists are being screened for the world's first face transplant. The face will be taken from a corpse. The idea is to give a real face to a burn victim who otherwise looks like a monster. Critics say the procedure is too physically and psychologically risky to justify for an aesthetic condition. Defenders say the face won't look like the dead person (because the recipient's bones and muscles will shape it) and it's safer than the current practice of using other body parts to make a new face.
Scientists are zeroing in on a Parkinson's drug that can cause compulsive gambling. The culprit seems to be pramipexole. In some cases, patients began to gamble pathologically soon after taking the drug. In other cases, they stopped gambling after they stopped taking it.
A national survey shows increased reporting of oral and lesbian sex. According to self-reports, 1) Most boys and girls aged 15-19 have had oral sex, slightly more than have had vaginal sex; 2) 14 percent of women aged 18-29 have had sex with a woman; and 3) among men aged 15-44, 6 percent have had oral sex with a man, and 4 percent have had anal sex with a man. The early spin is that the first two findings can be explained by fear of pregnancy.
Latest Human Nature columns: 1) The mainstreaming of anal sex. 2) The hurricane and the bioethics council. 3) The looting of New Orleans. 4) The political use of fetal pain. 5) The difference between blacks and animals. 6) The emerging technology of artificial wombs. 7) The case for growing embryos for their parts. 8) The evolution of creationism.