Why did Stephan Hawking not turn up to the meeting?
His internet connection ran out.
Hawking's Internet Problems
Explanation
Explain Bear
Hey, listen up, buttercup. The joke is that Stephen Hawking, who was known for using technology to communicate, missed a meeting because his internet went out. It's funny because even geniuses have tech problems, you know? And I bet you think a router is something you wear!