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.
Introduction. 1  What is your body made of? Your first thought might be that it is made up of different organsâsuch as your heart, lungs, and stomachâthat work together to keep your body going. 2  Atoms and molecules follow the rules of chemistry and physics, even when they're part of a complex, living, breathing being.