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Men want children later, but women can't rely on being able to. So I'm all for scientific advances and the help they can give people.

If two very different people pool their DNA, they'll create more genetic variety, and their young will come to the job of parenting with a wider array of skills.

For decades, parents were told by so-called parenting 'experts' that offspring would be best raised on the belief each is special and entitled to all life has to offer.

The trend of opinion among eugenists is that we must make marriage more difficult. Certainly no one who is not a desirable parent should be permitted to produce progeny.

Because we believe ourselves to be better parents than our parents, we expect to produce better children than they produced.

What we are doing to the future of our children, and the other species on the planet, is a clear moral issue.

There's no question that we have great value on the sanctity of the family, and there are a lot of competing visions about exactly how we teach a set of values and we teach skills to our children, especially in the early years when they're really forming their personalities, their personas, really.

Most couples manage to cooperate on child raising - for us, our brain project is our third child, so nothing different, really.

Once boys' and men's challenges are clear, the question 'why now' quickly becomes 'why didn't we see this sooner?' The answer? Virtually every society that survived did so by socializing its sons to be disposable.

And, that's what I truly believe that we're doing when we're advancing scientific knowledge is we're someday making the world better. Not only for our children, but for all people after that.