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Those of us raised in modern cities tend to notice horizontal and vertical lines more quickly than lines at other orientations. In contrast, people raised in nomadic tribes do a better job noticing lines skewed at intermediate angles, since Mother Nature tends to work with a wider array of lines than most architects.

From Sam Kean

The idea of critical windows extends beyond just vision, of course: almost every system in the brain has a critical window when it needs to experience certain stimuli, or it won't get wired up properly. The most obvious example is language: if you don't learn a language early on, it's nigh impossible to become truly fluent.

From Sam Kean

Guinea pigs are practically synonymous with experiments. Lab rats have become the workhorses of modern medicine. Genetics owes a huge debt to the humble fruit fly. There's almost no branch of the life sciences, in fact, that hasn't leaned heavily on one animal or another.

From Sam Kean

Animal vision - including human vision - is so biased toward movement that we don't technically see stationary objects at all.

From Sam Kean

The amygdala plays a crucial role in processing fear, and minus her two amygdalae, S.M. became unflappable. Studies of her are actually a hoot to read, since they basically consist of scientists concocting ever-more-elaborate ways of trying to scare her.

From Sam Kean

Despite what you might guess, when monitoring your breathing, your body doesn't care whether you're inhaling enough oxygen. It cares only whether you're expelling enough carbon dioxide - that's the gas that sets off the panic button when you're suffocating.

From Sam Kean

The amygdala is one of those brain structures that a lot of people know a little bit about, and there's a definite tendency to conflate the amygdala and the fear response itself - as if the amygdala, and the amygdala alone, 'causes' fear.

From Sam Kean

The amygdala is indeed crucial for monitoring our environment and deciding what's worth getting worked up over. Once the amygdala determines this, however, it merely trips another circuit to actually produce the panic.

From Sam Kean

In 'The Violinist's Thumb,' I talk about the poignancy of cells leaking across the placenta into both the mother and the child.

From Sam Kean

Microchimeric sharing means that, even if the mother loses a child, she'll have a small memento of him or her secreted away inside her. Similarly, a bit of our mothers live on in all of us no matter how long ago Mom died.

From Sam Kean

Sam Kean

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