Computer heart model recalls da Vinci's sketches

Five centuries ago, Leonardo da Vinci's intricate drawings transformed understanding of the human heart. Now a new computer model promises to do the same for modern-day cardiac care, experts say. The model is so realistic its four chambers beat in the same asymmetrical rhythm on screen as does a real heart in the human body. The model is the work of three British doctors who say the creation will improve both training and care during surgery.