Ampère’s cats
The mistakes of greater and cleverer men are a lesson and a consolation to us. Ampère had two cats for company, one larger than the other. But at times they disturbed the great physicist in his work because he had to open the door so that they could go in and out repeatedly. So he simply equipped the bottom of his door with two smaller openings—a big one for the large cat and a little one for the smaller cat. Let us be grateful to Ampère.
Alec Nevala-Lee 
I strongly suspect the smaller cat would go through the big opening and the big cat would squeeze through the smaller opening.
Dave L
May 17, 2015 at 9:15 am
That’s a fantastic point.
nevalalee
June 1, 2015 at 9:08 pm