“We do not see the world. We watch internal movies about the world." - Guy P. Harrison

Scientists believe that walking has this effect of enhancing creativity because it loosens the restraints and filters that our brains place on memory when we focus on a task. When one dedicates mental effort to something, the brain tries to help by shutting down what it deems to be irrelevant distractions from within. Walking can relax the mind enough to reduce these barriers and allow some unrelated memories to emerge. This is precisely what we want in order to maximize creativity. It helps when disconnected memories and disparate bits of information come forward, because they are often the source of new and unique ideas.

Every person is a collective, a vast and complex gathering of interdependent life. Any description of 'human' must acknowledge these intimate strangers. Our bond with microbes is such that they are not so much riders, parasites, and assistants as part human. And we, it's becoming increasingly clear, may need to begin thinking of ourselves as part microbe.

Science is not the latest religion and scientists are not exalted priests. We have to think of science as a wonderful tool that is also dangerous. Using it requires responsibility. Science gives us vaccines one moment, nuclear warheads the next. It's up to us to be wise tool users.