Simplify the following text for a Grade 10 native English-speaking person.
Original: SchrÃ dinger 's cat is a thought experiment , usually described as a paradox , devised by Austrian physicist Erwin SchrÃ dinger in 1935 .
Simplified: SchrÃ dinger 's cat is a thought experiment about quantum physics . Erwin SchrÃ dinger proposed it in 1935 , in reaction to the Copenhagen interpretation of quantum physics .