Let's clear out some of these articles

Here's an interesting article about a guy who's using squatter's rights to get houses in Florida.

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Gay Couples to Sue Over U.S. Marriage Law

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Genes as Mirrors of Life Experiences

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As H.I.V. Babies Come of Age, Problems Linger

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While Warning About Fat, U.S. Pushes Cheese Sales

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In Efforts to End Bullying, Some See Agenda

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From Brooklyn to Beijing, and Into a Caldron

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Random question(s).

Down's Syndrome is a type of trisomy - they have an extra copy of chromosome 21.

http://en.wikipedia.org/wiki/Aneuploidy

1. If somebody with some form of aneuploidy has a child, is it heritable at that point?
2. Sometimes, closely related species seem to have vastly different amounts of chromosomes. Do we know why this can happen? I mean, this isn't one of those slow development things that makes sense to me. How do extra sets of chromosomes appear (or spare sets disappear)?