細(xì)菌，追溯進(jìn)化 part 2 Hints: whale baboon eardrum magnet three-dimensional 因音頻缺失，給出最末句的最后3個詞：that I want.

Some reptiles developed feathers and became birds. Others became mammals in every shape and size from blue whale to baboon, every creature we see on the earth today including ourselves. All these happened. It's the miracle of evolution. The human body is just one branch in the huge spreading tree of life that grew from those simple bacteria.
Yet we carry with us the remnants of what has gone before us in our strange past, and there is a place we can go to see just one of those remnants, shaped by one of evolution's truly incredible transformations. It's inside my own head. All we need to do is go and find it.
This is my eardrum, a thin skin stretched tight across my ear canal. But what I want to show you lies on the other side of my eardrum. This device can take me there. I'm inside a huge magnet with a field strong enough to lift a car clean off the ground. It's a magnetic resonant scanner and it can reveal layer by layer what's inside my head. Up to now, this has been the forefront of medical imaging, but we are about to take it one step further.
By putting the medical scans together, we've created a three-dimensional picture of my own head and I can look at any part of it that I want.

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