28 (number) - in Science

In Science

  • The atomic mass of silicon.
  • The atomic number of nickel.
  • The fourth magic number in physics.
  • The curing time of concrete is classically considered 28 days.
  • The average human menstrual cycle is 28 days although no link has been established with the nightlighting and the Moon.

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    After sitting in my chamber many days, reading the poets, I have been out early on a foggy morning and heard the cry of an owl in a neighboring wood as from a nature behind the common, unexplored by science or by literature.
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    Science is a system of statements based on direct experience, and controlled by experimental verification. Verification in science is not, however, of single statements but of the entire system or a sub-system of such statements.
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