AI assistants now text you back, book your reservations, and track your flights, and this Random Show episode tests them live. Tim Ferriss and Kevin Rose also cover beta-alanine for climbing endurance, walnuts and sperm quality, dream engineering, and why books may need a sharper pitch. Instinct, an iMessage-based AI assistant, handled a flight change, a hard-to-get restaurant reservation, and a prescription pickup reminder for Tim Ferriss.