Add Yahoo as a preferred source to see more of our stories on Google. YOU KNOW ALL those buttons on top of McDonald's drink lids? People assumed they pretty much cracked the code when it was revealed ...

You've stopped into your favorite cafe, fast-food spot, or even your go-to gas station for a quick liquid treat. You order up your usual — a coffee, slushie, soda, whatever it may be — to go, and ...

You know all those buttons on top of McDonald's drink lids? People assumed they pretty much cracked the code when it was revealed that the round doodads indicate the type of soda inside, but it seems ...