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.
Polyvinyl chloride, also known as PVC or vinyl, is arguably one of the most toxic types of plastic in our lives. One reason why PVC is so toxic is that it is often mixed with softening chemicals called plasticizers, the most well known variety being phalates.