Nitrous oxide (laughing gas) is a sedative that health care providers use to help you relax during procedures. Find out its risks, uses, and the effects it may have on your health.

Plus, "they may make people's heart or lung conditions worse, and some people [about 2 percent] are too claustrophobic to use a mask." Experts also point out that there's more to using a gas mask ...

Alabama’s nitrogen hypoxia method, five years in the making, would use a gas mask to cause death. It is an alternative to the state’s standard method, lethal injection.

A death row inmate in Alabama was executed on Thursday, Jan. 25, using nitrogen gas. It marked the first U.S. execution carried out this way.

For some five years, preparation for war has been part of the education of every child in Europe. Last week Europe's children carried out their M-Day assignments. Paris began to evacuate its ...