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One teacher and scientist experienced a horrifying death all from a tiny drop, comparable to the size of a raindrop, of one chemical that touched her skin.
Working as a research chemist at Dartmouth College in New Hampshire, US, Karen Wetterhahn was closely studying the impact heavy metals have on living organisms when she herself became a part of the experiment. In the summer of 1996 the scientist was using a chemical known as dimethylmercury when a miniscule droplet fell from the tip of a pipette and made contact with her latex glove.
Despite taking all of the steps required for this type of work and immediately removing the gloves before wearing a brand new pair, it seems it was too late and the chemicals took hold. The compound had already seeped into her skin and, without her knowing, into her bloodstream.
At the time of the incident, Karen had no clue as to what was happening inside of her body until a few months later when she began to notice symptoms. These unusual effects included trouble balancing and issues with her speech and vision, and before she knew it, she was admitted to hospital in the following January.
It was there doctors ran blood tests and discovered that Karen had mercury poisoning, but not just mildly - her levels came out to be over 4000 times the recommended level. According to reports, Dr Ben Miles explained just how dangerous this droplet was, explaining that a single drop of the clear liquid can "change your life forever".
He explained: "Not immediately, but so inevitably that doctors can only watch as your brain slowly disintegrates. This is the horrifying reality of dimethylmercury... Once inside the body, dimethylmercury decomposes, releasing mercury ions that bind aggressively to sulphur atoms...
"Which are in particularly high abundance within the neurones of the brain and central nervous system. Robbed of the sulphur that they need, those neurones begin to malfunction and die."
It's thought the chemical can rapidly permeate layers of clothing and enter the skin within as little as 15 seconds. While medics were speedy in attempting to remove the mercury from her system, the damage was already too far gone.
Slowly, 10 months after being exposed, Karen slipped into a coma that left her on life support and eventually ended her life. Results revealed her mercury levels jumped after 17 days from the accident and peaked at 39 days, which triggered her unexpected decline.
This freak accident led to a long-lasting legacy Kaen left behind in the world of science and research. Included in this is the National Institute of Environmental Health Sciences, which has since created an award in her honour.
As a result, new precautions were introduced to labs using dimethylmercury, knowing that it is clear to have the ability to seep through materials such as latex, PVC and neoprene.
A 1998 report explains: "The gloves used in this incident were disposable latex examination gloves, and subsequent permeation testing of the gloves by a certified, independent testing laboratory indicated that the chemical permeates latex, PVC, and neoprene almost instantaneously."