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.
#7 â BPA. BPA, otherwise known as bisphenol-A, is found in the plastic used in water bottles and other manufactured products. A large number of studies on BPA have found its effects on the body to be toxic. If BPA leaches into bottled water, it could result in many different types of cancer.