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.
18.6% of body mass is carbon. Carbon takes many forms, including charcoal, graphite, and diamond. Dave King / Getty Images Carbon is found in every organic molecule in the body. Carbon is ingested in food the food we eat and in the air we breathe. Carbon accounts for 18.6% of the total mass of the human body. We even expel carbon as a waste product when we exhale in the form of carbon dioxide.