Life after death

I've always believed in a kind of immortality consistent with the laws of conservation of matter and energy: the way Lee Hays of the Weavers had his ashes put in his vegetable garden so the family could celebrate his return as a squash. However, last night on the radio I heard a physicist speak of the matter in far more out-reaching terms, and he succeeded in sending me to his book, which I will read. I admit a bias in favor of card-carrying scientists. Presumably they know what evidence is. Curious about his book, therefore.