MASSIVE CROWDS IN LIMITED SPACES: HAJJ AND OTHER RELIGIOUS PILGRIMAGES The Hajj is an extraordinary complex logistical undertaking. The Hajj represents not only an enormous number of people, but also extraordinary diversity of age, income, underlying healthfulness, illness and geographic origin. The heat can be brutal, and the crowds are tightly packed. Disease is likely [...]Read more
GLOBAL TRAVEL Humans travel in numbers and at speeds unprecedented in history. Travelers visit remote areas as well as major population centers. Humans may be displaced because of social, economic, or political upheavals or extreme events and environmental disasters. The elimination of spatial and temporal barriers, especially by long-distance air transport, means that humans can [...]Read more