WHAT ELSE IS A "HOTBED"?

In praise of CNN's description of Kenya as a "hotbed of terror"
  1. My house is a hotbed of 5 year-old terror
  2. The underside of my bed is a hotbed of dustbunnies
  3. My son's bed is a hotbed of stuffed animals
  4. The city where I live (DC) is a hotbed of hot weather