A page of the Numeropedia - the Special Encyclopedia of Numbers
2-dimensional (2D or 2-D) figure (or planar figure) has length and width (or 2 coordinates).
Among 4 scientists who received 2 Nobel prizes, two scientists won in 2 different categories, 2 won in the same category.
The number of Nobel prizes in Physics received by the U.S. physicist John Bardeen: in 1956 for the invention of the transistor in 1947 (with Walter H. Brattain and William Bradford Shockley) and in 1972 for the BCS theory on superconductivity in 1957 (with Leon Cooper and John Schrieffer).
The number of Nobel prizes received by the French/Poland scientist Marie Sklodowska Curie: in Physics, 1903, for the investigation of radioactivity (with her husband Pierre Curie and Henri Becquerel) and in Chemistry, 1911, for her discovery of two new elements.
The number of Nobel prizes in Chemistry received by the English biochemist Frederick Sanger: in 1958 for his works on proteins and in 1980 for works on DNAs (with Paul Berg and Walter Gilbert).
The number of Nobel prizes received by the U.S. scientist Linus Pauling: in Chemistry, 1954, for his work on structure of proteins and chemical boning and in Peace, 1964, for his work on nuclear test ban.
The number of poles in a magnetic field: North pole and South pole
One of seven magic numbers in nuclear physics: 2, 8, 20, 28, 50, 82 and 126. They are the numbers of nucleons such that they are arranged into complete shells within the atomic nucleus.
[Science] Sedimentary units of rock:
The size of clay unit is less than 1/256 mm.
The size of silt unit is from 1/256 to 1/16 mm.
The size of very fine sand is from 1/16 to 1/8 mm.
The size of fine sand is from 1/8 to ¼ mm.
The size of medium sand is from ¼ to ½ mm.
The size of coarse sand is from ½ to 1 mm.
The size of very coarse sand is from 1 to 2 mm.
The size of granule is from 2 to 4 mm.
The size of pebble is from 4 to 64 mm.
The size of cobble is from 64 to 256 mm.
The size of boulder is greater than 256 mm.