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.
Harmful Effects of Chemicals of Concern. Which toxic chemicals in Puget Sound are most dangerous? This isnât an easy question to answer since different chemicals cause harm in different ways and to different organisms. The hazard any given chemical poses depends on how toxic it is and how much enters the Puget Sound environment.