Our world is almost completely explored. Scientists have answers to almost all questions, and if there are no answers, then there is at least a theory of how this should work or happen. It would seem that everything is so, but so far, some things have no scientific explanation.
Placebo effect
A placebo is a “drug” with no therapeutic effect. Scientists have been puzzling over this mystery for a long time. How can a person recover from a pill - "pacifier" or regular saline solution?
Numerous experiments have shown that a person is able to recover even without drugs, if he is convinced that the pill - "dummy" will really help him and is a powerful medicine. From this, only one conclusion can be drawn - the brain is able to influence the biochemistry of the whole organism.
Dark matter
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Scientists disagree on how much space dark matter occupies in the universe. Some say 70%, others say 30%. And this is all because dark matter cannot be seen or detected. Scientists simply know that there is something super-heavy and invisible in every galaxy.
The first theories and guesses about the existence of dark matter appeared about 60 years ago. But astronomers still cannot determine what kind of matter it is and whether it exists at all. But if it does not exist, then where does the “extra” mass in galaxies come from?
Why are there different blood types?
Scientists know almost everything about human blood. But one question still remains unanswered. Why do people have different blood types and what is the point in all this?
It turns out that the blood of one person, with a high degree of probability, will not be suitable for transfusion to another person. Why did nature come up with this and what is the point in this, from the point of view of evolution. Scientists still cannot give an exact answer to this question.
Why do we dream?
One half of people are sure that dreams are just a random set of pictures, our imagination and brain impulses. The other half are sure that sleep is our experiences, problems and desires that have deep meaning.
But no one will give you an exact answer. There is even a special science that deals with the study of dreams, dreams - oneirology. Scientists are sure of only one thing - dreams are the result of the mental state of people.