 You can't do more than one thing at a time. What you do is you juggle very rapidly between tasks. You're like, what did Jeremy just ask me? What does it say on the TV there about President Biden's messages at NATO? What is this message on WhatsApp? What does it say on Facebook? Wait, Jeremy, what did you ask me again? And it turns out that juggling comes with a really big cost. The technical term for that cost.