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.
The majority of Bramble Berryâs micas contain only mica and iron oxides, which both readily occur in nature and can be considered natural. If the mica is colored with FD&C colorants, the mica is not considered natural. Below are a list of micas that are colored using FD&C colorants. You can find the ingredients of each Bramble Berry mica in the mica product pages.