Why do uncharged metal sheets attract in vacuum?

[H_man]

Q&a Game For Fun !

Ok... Just came across something weird and interesting in one of my physics books and I thought I'd share it and start one of those Q&A games I've seen on this forum!

"When two parallel uncharged metal sheets are placed in a perfect vacuum, they attract each other with a tiny force that is not Gravitational. What is the source of this effect?"



The person who comes closest to the solution can pose the next question!

 

[Meir Achuz]

Casimir force.
Why is a crow?

 

[H_man]

Wow...

100% correct Meir Achuz

Though I am not sure how much physics is in your question.

 

[H_man]

Ok... I give up. What is the answer (and the connection to physics)?.

 

[Meir Achuz]

"caws"
Physics is solving problems methodically.