For the first half of geological time our ancestors were bacteria. Most creatures still are bacteria, and each one of our trillions of cells is a colony of bacteria. Richard Dawkins
Think of the earth as a living organism that is being attacked by billions of bacteria whose numbers double every forty years. Either the host dies, or the virus dies, or both die. Gore Vidal
Salad bars are like a restaurant's lungs. They soak up the impurities and bacteria in the environment, leaving you with much cleaner air to enjoy. Doug Coupland
We can, for example, be fairly confident that either there will be a world without war or there won't be a world - at least, a world inhabited by creatures other than bacteria and beetles, with some scattering of others. Noam Chomsky
What you see is that the most outstanding feature of life's history is a constant domination by bacteria. Stephen Jay Gould
