← Newton's Apple · Season 7Rain Forest; Buoyancy; Pouring Catsup; Lemons; Cold RemediesS7 · E4 · 04 Nov 1989 · 30 minNo image← 3. Race Cars; Spider Webs; Lemons; Tropical Fish5. Caffeine; Butterfly Migration; Autumn Leaves; Lemons; Doppler Effect; Sloth →