As Bulgaria formally adopts the euro currency this January 1, residents in the capital Sofia queued up in front of ATMs just after midnight to withdraw the new banknotes. Also in this edition: the world's 500 richest people added a record $2.2 trillion to their fortunes in 2025. Plus, on the occasion of Netflix's "Stranger Things" finale, we see how the show became a cash machine for the streaming giant over the past decade.