Elon Musk's legal team has warned Twitter that the Tesla boss could walk away from a $44 billion deal to buy the social media giant, accusing it of breaching its contractual obligations by not sharing information about how fake accounts are calculated. We take a closer look. Plus, at its annual Worldwide Developers Conference in Palo Alto, Apple launches a redesigned MacBook Air and a MacBook Pro with a new chip that makes them faster and more powerful.