
In 2009, Stephen Hawking held a party with:
✨ Champagne
🎉 Decorations
🕰 EXACT coordinates in spacetime
❗No invitations were sent out until after the party already happened
He did this deliberately.
Because if time travel to the past were possible, time travelers from the future should be able to see his post-dated invitation and come back to attend.
Nobody came.
🔍 Why?