When we first moved to Dallas, we had an English gardener, Patrick Butterworth, who ended every letter, birthday card, and bill with the above phrase. Over time I have come to appreciate how incredibly apt this phrase describes so many systems, from the human body and how well it heals, to the garden, to the pasture and the animals on it. Diversity has been shown to be an important part of any ecosystem, whether one is looking at the boardroom, the gut flora, or the soil. For our gut flora, we want a diverse population of bacteria, archaea, viruses, and fungi that together shape our physiology, guide our immune system,…