From the Wikipedia article linked in TFA: > Following classical probability argu...

		jihadjihad 36 days ago \| parent \| context \| favorite \| on: The sisters “paradox” – counter-intuitive probabil... From the Wikipedia article linked in TFA: > Following classical probability arguments, we consider a large urn containing two children. I like how they modified a classic from probability texts, drawing items from an urn, and made sure it would be big enough in this example to accommodate two kids.

This is better than an "assume a spherical cow" joke in the wild.