In 1799 someone discovered that a medium rare steak has a temperature of about 140*F.
Have you ever burnt a steak on a BBQ?
If you want 140*F, why cook a steak at a much higher temperature and risk runing it?
Enter "Sous Vide". Today you can go to 5 Star restaurants that cook steaks Sous Vide.
You can buy a Sous Vide machine for $399.00 at Bed Bath and Beyond.