Whencarbonisaddedtoironintheproperproportions,theresultissteel.
Someanimalspantandsweattospeedevaporationofbodymoistureandthuscoolthemselves.
Thecontrolsofmostmodernairplanescanbeoperatedeithermanuallyorautomatically.
Formulatedin1823,theMonroeDoctrineassertedthattheAmericaswerenolongeropentoEuropeancolonization.
Thefearofsmallpox,whichterrorizedtheeighteenthcentury,hasnoanalogy(likeness)today.