You count too : a common-sense guide to happier parenting -- The case against guilt : a parent's guide to behavioral genetics -- Behavioral genetics : can it be true and what does it mean? -- What about the children? kids today are safer than ever -- Enlightened family planning : how many kids do you want when you're sixty? -- Your kids are good for you : but are they good for the world? -- Selfish guidelines for want-to-be grandparents -- Life-giving science: what it means for you -- Be fruitful and multiply: four chats on kids, parenting, happiness, and self-interest.