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 PIE The number Pi, denoted by the Greek letter π - pronounced 'pie', is one of the most common constants in all of mathematics. It is the circumference of any circle, divided by its diameter. Nobody knows its exact value, because no matter how many digits you calculate it to, the number never ends. For most practical uses, you can assume it is 3.142. Some people have written computer programs and calculated it to an astonishing accuracy. For example some have calculated pi to 200 million digits. If you just need a rough value for Pi you can assume it is 22/7, but this is only accurate to two decimal places. However it may be accurate enough for some uses when you don't have a calculator handy. An even more accurate approximation is 355/113. This is correct to 6 decimal places. VALUE OF PIE 3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679821480865132823066470938446095505822317253594081284811174502841027019385211055596446...

CELL The cell (from Latin cella, meaning "small room") is the basic structural, functional, and biological unit of all known organisms. A cell is the smallest unit of life. Cells are often called the "building blocks of life". The study of cells is called cell biology, cellular biology, or cytology. Cells consist of cytoplasm enclosed within a membrane, which contains many biomolecules such as proteins and nucleic acids. Most plant and animal cells are only visible under a light microscope, with dimensions between 1 and 100 micrometres. Electron microscopy gives a much higher resolution showing greatly detailed cell structure. Organisms can be classified as unicellular (consisting of a single cell such as bacteria) or multicellular (including plants and animals). Most unicellular organisms are classed as microorganisms. Cells were discovered by Robert Hooke in 1665, who named them for their resemblance to cells inhabited by Christian monks in a monastery. Cell theor...

 About Universe The  universe  is all of  space  and  time  and their contents,  including  planets ,  stars ,  galaxies , and all other forms of  matter  and  energy .  The earliest  cosmological models  of the universe were developed by  ancient Greek  and  Indian philosophers  and were  geocentric , placing  Earth  at the center.   Over the centuries, more precise astronomical observations led  Nicolaus Copernicus  to develop the  heliocentric model  with the  Sun  at the center of the  Solar System .  The  Big Bang  theory is the prevailing  cosmological  description of the development of the universe. According to estimation of this theory, space and time emerged together  13.799 ± 0.021 billion years  ago  and the energy and matter initially present have become less dense as the ...