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.
Picric acid is extremely explosive. Sulphuric acid can also be dangerous if in contact with eyes, skin, mouth or other acids. Of the common laboratory acids, the most dangerous to work with is usually concentrated nitric acid because it reacts so strongly with so many chemicals, releasing poisonous gases. It also fumes, can cause explosions, and instantly oxidizes flesh causing severe burns.