The opponent in either an ordinary or religious disagreement asserts you have made a mistake. To avoid mistakes we strive to have good justification for beliefs which holds us connected to them during difficult challenges, similar to how a good boat tether, pictured on this book's front cover, holds[...]

Proposals to make us smarter than the greatest geniuses or to add thousands of years to our life spans seem fit only for the spam folder or trash can. And yet this is what contemporary advocates of radical enhancement offer in all seriousness. They present a variety of technologies and therapies tha[...]