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Find the area of the shaded region

Find the area of the shaded region accurate up to 3 decimal places. (A=?, r=1389)

Correct answers: 39

The first user who solved this task is Dejan Mratinkovic.

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Smiling can be difficult

Smiling can be difficult.
It involves rearranging your basic frowndations.

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John Smith

Died 22 Nov 2003 at age 78 (born 8 Dec 1924).English microbiologist who was a pioneer in the field of nucleic acid research. He helped to establish the structure of RNA and to discover the methylation of the bases in bacterial DNA. The RNA structure information was crucial to the double-stranded model of DNA proposed by Watson and Crick. He contributed to the methodology involved in the unravelling of the secrets of the genome. In the early 1960s, Smith became involved in unravelling the process whereby the sequence of bases in DNA determines the assembly of the different amino acid sequences of proteins which are responsible for all our bodily functions (structural, enzymatic, hormonal, and so on), a process known as protein synthesis.

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