Mathematicians do it with imaginary parts. Mathmaticians do it an uncountable number of times. Mathmeticians do it with pencils. Mathematicians take it to the limit Mayor Daley does it 5 times every election day. Mechanical engineers do it automatically.
Medical researchers make mice do it first.
Milkmen do it in the morning. Milkmen deliver twice a week Millionaires pay to have it done. Miners sink deeper shafts. Miners do it with a bang. Ministers do it only on Sunday.