Why do cockroaches go inside California homes during the summer? Here's how to stop them yahoo.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from yahoo.com Daily Mail and Mail on Sunday newspapers.
Take an invasive plant, already a threat to ecosystems, and add insult to injury: Stinknet, which smells as pleasant as it sounds, has forced the temporary closure of a picnic area at Arizona's Casa Grande Ruins National Monument.