You have two eyes and two ears, but there must be much more things than what you see or hear. You know only a little. There must be a vast world modern science hasn’t caught yet. Scientists are exploring around the marginal region of the human knowledge, and expand it gradually. By the way, you, a normal citizen, sometimes come across strange phenomena which you cannot explain well. They don't seem to be of great importance. They don't have relation to astronomy, DNA, or AI. They are only tiny episodes in your daily life. Can’t those strange phenomena be the proof that something or someone unknown exists?