Contrary to what many people think, science by definition doesn’t prove anything. In fact, the job of a scientist is to disprove the work of former scientists. This is how science as a whole progresses. By figuring out what doesn’t work (which tends to be easier), we can figure out what does. At any rate, there are some things that we just haven’t figured out yet. We may have a vague idea of what is going on, but the jury is still out. These are 25 things that scientists are surprisingly still unsure about.
Although we have a general idea of what is good and what is bad, the science is still a work in progress. (Just consider how we updated the food pyramid!)