Scientists say there are two states of sleep, Non-rapid Eye Movement (NREM) during which the brain exhibits low metabolic activity and Rapid Eye Movement (REM) during which the brain is very active. If you ask different people about their dreams, you would get different answers. Scientists say that dream occurs during our deepest sleep.
4. Mysterious UFOs and Crop Circles
An unidentified flying object, often abbreviated UFO or U.F.O., is an unusual apparent anomaly in the sky that is not readily identifiable to the observer as any known object. While technically a UFO refers to any unidentified flying object, in modern popular culture the term UFO has generally become synonymous with alien spacecraft.
Many argue that these objects appear to be technological and not a natural phenomenon, and are alleged to display flight characteristics or have shapes seemingly unknown to conventional technology.
A crop circle is a sizable pattern created by the flattening of crops such as wheat, barley, rye, maize or rapeseed. While the exact date crop circles began to appear is unknown, the documented cases have substantially increased from the 1970s to current times. Twenty-six countries reported approximately ten thousand crop circles in the last third of the 20th century.
It is suggested by some cryptologists and others that crop circles are depicted in prehistoric stone and wall carvings, such as in the spiral patterns carved in stone at Newgrange in Ireland. For those that hold the view that crop circles are created by extra-terrestrials in spacecraft, some would say that reasonable recorded proof of this is depicted in some ancient Egyptian pictures.
5. Mysterious Origins of Life
The earth we live is estimated to be 4.54 billion years old. Life may develop directly on a planet or satellite or be transferred to it from another body.
The earliest evidence for life on earth comes from fossils of cyanobacteria called stromatolites in Australia that are about 3.4 billion years old. These bacteria which are still around today are already biologically complex. They have cell walls protecting their protein-producing DNA, so scientists think life must have begun much earlier, perhaps as early as 3.8 billion years ago.
The answer to this question would not only fill one of the largest gaps in scientists ‘understanding of nature but also would have important implications for the likelihood of finding life elsewhere in the universe’. An absolute requirement for life is an energy source.
As the existence of life beyond Earth is currently uncertain, planetary habitability is largely an extrapolation of conditions on Earth and the characteristics of Sun and solar system which appear favorable for life to flourish. Looking for answers in the other planets might provide a solution.
The idea that planets beyond Earth might host life is an ancient one. Understanding planetary habitability is partly an exploration of the Earth’s conditions, as this is the only planet currently known to support life. Despite knowing approximately when life first originated on Earth, scientists are still far from answering how it first appeared.
We don’t really know whether these biggest mysteries of science will ever get solved. But we are sure about one thing. We will keep trying to find answers that really make sense. We are extremely grateful to those great minds that helped us solve some of the intriguing mysteries of the past.
This article was inspired by the following Albert Einstein’s quote:
The human mind is not capable of grasping the Universe. We are like a little child entering a huge library. The walls are covered to the ceilings with books in many different tongues. The child knows that someone must have written these books. It does not know who or how. It does not understand the languages in which they are written. But the child notes a definite plan in the arrangement of the books – a mysterious order which it does not comprehend, but only dimly suspects.