Vitamin D levels, which play a role in the body's immune response and vary with exposure to sunlight, make latitude of residence a possible risk factor.

WSJ: The Research Report: Slapping On a Skin Patch to Combat Hay Fever

This finding raises the question: can a small diameter lead be sufficiently robust to perform reliably over years of biologic exposure and mechanical stress in the human body?

FORBES: Robert Hauser, ICD Watchdog, Offers Viewpoint On Riata Controversy At HRS

Otherwise, it's aimed more at the casual carry-around crowd with a 40 percent smaller body, touch-screen focus selection, control ring exposure adjustment, a 3-inch 920k dot TFT LCD, art filters (in the smartphone app), image (or film) stabilization and 1080P 30 fps HD video.

ENGADGET

Exposure to lead can affect virtually every system in the body and cause intellectual and behavioral deficits.

CNN: Baby food makers in California court over lead warnings

The hope was that exposure to the genes would prompt an immune response in the body so that cells containing HIV virus would be recognised and destroyed.

BBC: NEWS | Health | Merck abandons HIV vaccine trials

One of the more popular theories is "the hygiene hypothesis, " which says that exposure to germs and parasites in early childhood somehow prevents the body from developing certain allergies.

NPR: Study: Food, Skin Allergies Increasing In Children

If homosexuality is caused by unusual in-utero testosterone exposure (a plausible hypothesis), then the system that controls body odour may change in related and detectable ways.

ECONOMIST: Support for the idea of human sex pheromones

The radiation exposure from a Mars journey is similar to getting a full-body CT scan every five or six days, said lead researcher Cary Zeitlin of the Southwest Research Institute in Boulder, Colo.

NPR: Astronauts Face Radiation Threat On Long Mars Trip