ADDing Up

It is well known that ADD/ADHD runs in families (in some opinions ADD is the 2^nd most inherited trait, next to height). Consider these findings:

• If one sibling of a pair of identical twins (who share identical genes) has ADD, the other has 81% chance of having it. This number drops to only 29% for non-identical, or fraternal, twins.
• If one parent has ADD, the child has 60% chance of having it as well. If both parents have ADD, the probability goes up to 85-90%.
• Parents of ADD kids are 24 times as likely to have ADD themselves.

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We saw how our brain got bigger in size over the last 3.5 million years, as we evolved from our earliest known human ancestor, the hominids. Is human brain evolving even today?
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We have seen how modern humans evolved from hominids, their earliest known human ancestor who lived millions of years ago. Concurrent with this change in body shape, there was also a dramatic growth of our brain size.
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Darwin’s Evolution is perhaps the only fundamental theory (and fact) in all of sciences that is easy to explain, which is what I will try to do here. Because I often use ideas from Evolution to think about the origin of ADD, this article will hopefully serve as a quick refresher.
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