Insurance actuaries have calculated that even if everyone were physically immortal, the average life span would still be only be 400 years because of the "accident rate"; eventually, everyone would die of a fatal accident and it would be very unusual to encounter anyone more than 800 years old. Therefore, it would seem that the only practical way to achieve actual immortality is to upload one's mind into a supercomputer to live in virtual reality. Futurists such as Ray Kurzweil believe this will become possible about the year 2045 in the technological singularity.