After discussing how submarines surface and dive (in other words, "how do you store buoyancy?) and our one-of-a-kind "Just the Headlines!" segment, we take a look into the history of red food dye, and what to look out for if you want to avoid the "bad" kind of food coloring. Spoilers: You want the dye made from smashed up bugs grown on a cactus. Now go paint the town red!