We have magnificent brains—and use them to believe nonsense and behave as fools. . . . We are enslaved to delusions and too often the servants of sub… - Guy P. Harrison

It's the 21st century and still we have no universally agreed upon definition of life. It seems the universe does not care about our desire for tidy categories and tight descriptions. Our intellectual comfort is irrelevant to reality. When it comes to life, gray zones and blurry boundaries abound. This is bizarre considering life has been on our planet for more than 3.5 billion years and it's all around us now. Life saturates Earth's surface zone, from more than a mile deep in the crust to the stratosphere miles above. Its diversity and overall success are staggering, difficult to comprehend. For example, some scientists estimate that there are more than one trillion species alive right now. In total, Earth may have hosted more than 100 trillion species so far. Life is no stranger to us. And yet, what is it?

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.

Museums matter because they are invaluable points of collection and contemplation for a species with a complicated past and self-awareness issues. Somewhere in their wonderful mix of beauty, fact, fiction, lies, and error we discover crucial truths about us.