Should we eliminate the human ability to feel pain?

In yesterday's Daily Explainer we told you all about pain — why it exists, how it works, and how scientists are trying to quantify its effects. Though pain has clearly served an important evolutionary purpose, not everyone is convinced that we still need it. A growing number of forward-looking thinkers are suggesting… » 9/27/12 9:00am 9/27/12 9:00am