The average typing speed is 38-40 words per minute (wpm) for adults  in a professional working environment (despite many incorrect  reports on the web that it is 50-60 wpm).
Chronic Health Effects The following chronic (long-term) health effects can occur at some time after exposure to Mica and can last for months or years: Cancer Hazard * Some Silicas have been shown to cause cancer in animals. The risk of cancer in humans from Mica is unclear at this time.
In its pure form rapeseed oil is considered mildly toxic to humans when consumed in high quantities due to its high levels of erucic acid. But, a shift to canola oil, also known as rapeseed 00, in the seventies produced an edible oil for human consumption.