Empty category principle

Related events

• Ball lightning
  date unknown · —
• Stanford prison experiment
  Aug 14, 1971–Aug 20, 1971 · United States
• Milgram experiment
  Jan 1, 1963 · United States
• Wow! signal
  Aug 15, 1977 · United States
• Double-slit experiment
  date unknown · —
• Hanlon's razor
  date unknown · —