The United States has stumbled into a potential military confrontation with Russia over Ukraine - a dangerous predicament that could become a Cuban Missile Crisis in reverse.
The "Black Death" moved across Eurasia, driven by climate events that were and still are frequently occurring.
Valerie Tarico is a psychologist. She is the author of 'Trusting Doubt: A Former Evangelical Looks at Old Beliefs in a New Light." She is also the founder of WisdomCommons.org.