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.
1 Compact bone: the heaviest, hardest type of bone in the body. 2  Lining cell: flat cells that make up and cover the outer layer of bone. 3  Marrow: a soft tissue found inside bones. 4  Osteoblast: cells make new bone. 5  Osteoclast: cells in your body that break down bone material in order to reshape it.