There are 20-some screens of information in this online module, follow the "forward button"  from one to the next.

There are also many branching links to information which is not a part of the training module through-way, but which might help some people achieve better understanding of the material, depending on their existing level of understanding of US safety and waste regulations and jargon, laboratory operations, and the English language.  Read any and all of the "asides" necessary to obtain as much understanding as possible, but don't get lost!