A game children used to play: Hold a buttercup under your chin. If it reflects yellow, which it usually did, then you like butter!
The game tells us more about the flower buttercup than our taste preferences, though.
Scientists have long wondered about the shiny surface on the 500 varieties of buttercups, according to livescience.
According to a study by the University of Lausanne in Switzerland, buttercups have a unique mirror-like reflective surface. The top layer of the petals are ultrasmooth and contain pigments that absorb blue light, leaving yellow light to reflect back to the eye. Under the top layer is a pocket of air followed by the starch layer. The interaction of the layers give the flower its shine, much like the shine yo see on a bubble of soap.
