Episodes:br br “The Lever” - While Stef tries to introduce the intricacies of the human brain, Brian becomes increasingly fascinated by a large lever on the desk in front of him.br br “Sound Effects” - Brian & Stef introduces the exciting world of sound, but when Dan appears with a guitar to demonstrate the sound of music, Stef & Brian interrupt his performance with bursts of odd sound effects.br br “The Weather” - Brian gives out a weather report with unexpected consequences for Stef & Dan.