Actually, Americans didn’t all evolve from 1620. There were already Americans when America was discovered. Many more Americans are immigrants, which means they adapted there and did not evolve there. The question is loaded. It is not a simple question at all.

“There are 750 trillion connections in the brain. The 1st brain emerged 600 mya.”
Similarly, this presupposes that all kinds of brains are generic with x amount of connections. Brains, like other organs, are grown. They are not inserted in a factory, as your question implies.

It further supposes that there were no predecessor to brains before 600 mya.

I presume that you are talking about a human brain? I’m not sure. Humans are primates. Primates are thought to have evolved 63 mya. Not 600. That’s primates, the order of which not all members have the same size brain. Humans evolved a little later, at approximately 200 000 years ago. Human brains are larger than monkey brains, although you would not say that considering how some people drive or how some claim divine intervention when they can’t outside the box.

Point being, these are not simple questions and they are not intelligent questions.

Sadly, I now believe that some, most or all evolutionists are unable to explain the brain’s evolution.

“I can’t believe all those professors are unable to explain brain evolution. There must be some mistake.”

I’ve never banned anyone from this blog and don’t intend to any time soon. I hold the philosophy that the daft are their own worst enemy and it is far more beneficial for everyone to witness them shooting themselves in the proverbial foot.

Another unanswerable question later. Eventually you’ll have to ban me. You Angry Americans. Poor Iraq.

S Keita starts off talking about connections in the brain. Neural connections are connections between neural cells. They are formed and decay with learning. You can think of connections as tree branches – the nature of neural cells is to branch out and form connections. The neurons do have some general pattern to them – but more in terms of “grow this direction”, “grow X millimeters long”. You can think of the different types of neurons as different plants. The genome doesn’t control the exact connections of neurons any more than plant genomes control the exact positions of each leaf. Rather, there is a general pattern which is repeated by lots of neurons. (Also, in embryos, you can transfer sections of the brain to other sections. The neurons adapt to their new locations just fine – and the brain works fine. This shows that there some sort of general mechanism neurons are using – each neuron is not custom-tailored.)

The genome controls the growth of the body by controlling the number of cell duplications in gestation. Lengthening or shortening a limb doesn’t mean the genome adds or removes “add a cell. add a cell. add a cell”. Rather, it changes the number of cell duplications that happen.

So, to increase the number of brain cells – that doesn’t mean the genome needs additional “add a neuron. add a neuron. add a neuron.” instructions. Rather, it says, “keep growing the brain for a longer period of time”, or “grow faster” – so that you end up with a larger number of cell duplications. The brain has an inherent structure to it, but the genome doesn’t need to micromanage brain development like S Keita seems to think it does.

I reply: How do it work then?