The human body is remarkably resilient. Your body can withstand a great deal of abuse. It bounces back to fight off many infections, repair strains and sprains, and heal broken bones. You may drive hundreds of miles in a day, fly across multiple time zones, and travel to other countries and other continents.

The world is changing. Global populations continue to migrate to urban areas. These ongoing relocations have a profound impact on deeply interconnected environmental systems and also lead to substantial distortions in human biosystems. In a word and to no one's surprise, living in big cities comes with