In an attempt to find an antidote to phosgene, a toxic gas used as a weapon during World War I, Nazi doctors exposed 52 concentration-camp prisoners to the gas at Fort Ney near Strasbourg ...

As gas masks were distributed, which largely negated the effects of chlorine, the chemicals used became more sophisticated, first with phosgene and then mustard gas, which burned the skin as well ...

In an attempt to find an antidote to phosgene, a toxic gas used as a weapon during World War I, Nazi doctors exposed 52 concentration-camp prisoners to the gas at Fort Ney near Strasbourg ...