This is such a simple concept
It all started out with a really adorable series of photographs from April Maciborka and David Wile. In the photos we can see babies trying lemons for the first time and reacting with faces of excitement, glee, horror and all the other associated reactions you can think of when they first taste what bitter is.
The original set of images can be seen below. They went viral as soon as they were posted.
The artists have now gone one better with a video in slow motion showing babies reactions to lemons.
Scroll down for the video.