The Magic School Bus is a children's animated series based off of the book series which is about a teacher Miss Frizzle and her diverse students who discover various science topics by going out on adventurous field trips.
Flashcubes - You slid a lever to spin the flash after EACH picture. 4 flashes on each bulb then that was it, you had to pop in another flash cube. No cube? No flash! I can still remember the smell they made after you flashed one.