Problem is we're way off being able to prescribe these things knowing with certainty that they'll work to our advantage. I'm saying that as a one-time biochemist and long-time pill pusher myself. Take selenium and prostate cancer. The picture is cloudy. A researcher in the field whose earlier work offered support for Se supplementation now wonders if it's such a good idea. Whatever Kurtzweil's taking, I hope it works for him.