1. A Death in Devizes 2. Possessed 3. The Cannibal Disease 4. Neuro-Invasion 5. On the Trail of a Killer 6. Straining the Hypoothesis 7. Consuming Fears 8. The Human Toll 9. Blood Simple 10. Can It Happen Here?

The article discusses the discovery of a possible link between the growth factor interleukin-7 and an increase in the number of active T cells among HIV patients. The need for a T cell booster among some patients for whom normal cocktails of antiviral drugs do not produce a higher T cell count is mentioned.

The ozone hole keeps the Antarctic continent's interior part cold and the ban on global chlorofluorocarbons is causing rapid recovery of the ozone levels. The lower stratosphere region absorbs more ultraviolet light and causes break down of circulation patterns.

The article reports on a study published January 15, 2008 in the "Proceedings of the National Academy of Sciences." It found the sperm of mice living downwind from steel mills and an important freeway contained 60 percent more mutations than did the sperm of mice breathing cleaner air. Because they were still viable sperm, these mutations could be inherited.

Ambiguous images seem to flicker between two alternatives, as if the brain cannot quite make up its mind how to perceive them. The Necker Cube, for instance, sometimes looks as if it is pointing into the page and sometimes appears to point out. In an experiment on volunteers with different kinds of ambiguous visual and auditory stimuli, Christ of Koch of the California Institute of Technology and his colleagues found that the pupils dilated around the time that perception shifted. The extent of the momentary dilation, which could be as much as one millimeter, also correlated with how long that particular perception lasted. Because the neurotransmitter norepinephrine controls the pupils, the compound may also play a role in rapid, unconscious decision making.