To turn on the AutoRecover feature: 1  In Word 2010, from the menu, select 2  . In the window that opens, click the tab, icon, or list item. 3  If it is unchecked, check , and type a value next to minutes. 4  Click to make the change.
What is tooth enamel? Tooth enamel is a hard substance found in the shell of each of your teeth and is the part of the tooth thatâs visible when you look in your mouth. Enamel is considered the hardest substance in the human body. Itâs even harder than your bones; however, it can dissolve or decay when exposed to acid and a build-up of bacteria.
Collagen is the most abundant protein in the human body and is the substance that holds the whole body together. Protein makes up around 20% of the body's mass, and collagen makes up around 30% of the protein in the human body. 2  There are at least 16 types of collagen, but 80-90% of the collagen in the body consists of types I, II, and III. 3  Type I collagen fibrils are stronger than steel (gram for gram).