Drop a lobster in boiling water and the lobster will thrash around wildly. Pierce an earthworm with a fishhook and the worm will twist and writhe in excruciating pain.
Or will it? Do these animals really feel pain? Or are their movements just muscles automatically contracting due to an outside stimulus?
"You're dealing with the fundamentals of pain and what pain is," said Tony Yaksh, professor of anesthesiology at the University of California at San Diego. "It's complicated -- how do you...Full Story