Eight: Prof Hilary Greaves on moral cluelessness, population ethics, & harnessing the brainpower of academia to tackle the most important research questions

The barista gives you your coffee and change, and you walk away from the busy line. But you suddenly realise she gave you $1 less than she should have. Do you brush your way past the people now waiting, or just accept this as a dollar you’re never getting back? According to Hilary Greaves, this simple decision will alter the identities of almost all future generations.