[dpe82]

Whenever I hear libertarian economic theory I always picture my physics professor prefacing every problem with "assume a perfectly uniform sphere..."

[araes]

Milk production at a dairy farm was low, so the farmer wrote to the local university, asking for help from academia. After investigation, the physicist returned to the farm, saying to the farmer, "I have the solution, but it works only in the case of spherical cows in a vacuum."

https://en.wikipedia.org/wiki/Spherical_cow