The possessive disconnect of ‘each’ and ‘everyone’

LET’S talk about the prickly disconnect that develops when indefinite pronouns are used as antecedents of nouns in the possessive case.

A student, Mary Anne Fernandez, recently asked me this provocative question in Jose Carillo’s English Forum: “My English teacher posted this sentence on his Facebook wall: ‘Each student should value their education.’ Is this grammatically correct?”