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.
DBP is the first of the toxic trio. The other two toxic ingredients commonly found in nail polish include: 1  Toluene, which is made from petroleum or coal tar. 2  Chronic exposure linked to anemia, lowered blood cell count, liver or kidney damage, and may affect a developing fetus.he other two toxic ingredients commonly found in nail polish include: 1  Toluene, which is made from petroleum or coal tar. 2  Formaldehyde, a skin, eye, and respiratory irritant, and a known carcinogen (formaldehyde exposure has been associated with leukemia specifically).