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.
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Whether fingerprints are unique
People have even been shown to have fingerprints that are so similar, scanners couldn’t tell the difference. So do we really all have unique fingerprints? It’s still an open question.
The Mcclintock Effect
This is the name given to the phenomenon of women living together having their menstrual cycles sync up. Apart from a discredited study in the 70’s, there is no scientific evidence of this.
Sugar causing hyperactivity
There is actually a lot of evidence now that sugar has no effect on hyperactivity. It’s mostly expectation bias.
Why we sleep
We actually aren’t sure why we sleep. We definitely don’t exert ourselves enough to require 8 hours of rest per day, so it’s not quite as simple as it seems.
There is actually a lot of resistance to polygraphs in the forensic community because there is no scientific evidence that they work.