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.
BPA and Infertility. One of the more disturbing BPA toxic effects is its role in infertility. 1  Itâs almost impossible to avoid BPA contact because, in addition to being in most packaged food items, itâs an environmental contaminant.  BPA affects hormone balance and causes male reproductive dysfunction.