← Newton's Apple · Season 7Marathons; Celestial Navigation; Cataracts Chat; Lemons; EchidnaS7 · E10 · 16 Dec 1989 · 30 minNo image← 9. DNA; Rube Goldberg Contest; Parrot Chat; Chewing Tin Foil; Seahorse11. Spinal Cord; Glue; Lemons; Dog Behavior →