Calc is controlled by many variables, most of which can be reset
from within Calc. Some variables are less involved with actual
-calculation and can be set outside of Calc using Emacs'ss
+calculation and can be set outside of Calc using Emacs's
customization facilities. These variables are listed below.
Typing @kbd{M-x customize-variable RET @var{variable-name} RET}
will bring up a buffer in which the variable's value can be redefined.