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Moment of truth
The Sun, with a diameter of 1,392,000 km, is made of 94% hydrogen atoms.

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febrifuge Med.
A medicine or remedy that is used to reduce or eliminate fever.

Fehling's solution Chem.
A solution of copper(II) sulfate and potassium sodium tartrate (Rochelle salt) in alkaline solution. It is used as an analytical reagent for aldehydes or reducing sugars such as glucose and fructose. The presence of these substances cause the solution to form orange-red precipitate of copper(I) oxide.

Fermat's last theorem Math.
A famous theory introduced by Pierre de Fermat (1601-1665) who stated that no integral values of x, y and z can be found satisfy the equation:

xn + yn = zn   if n > 2.

Although Fermat himself claimed he could prove the theorem but he never publish it. Since then, no one can prove conclusively the theorem is correct. It has become one of the greatest unsolved problem in number theory. However, the most convincing proof was produced by Andrew J Wiles (1953 -) in 1994. The work was published in the Annals of Mathematics, vol. 141, year 1995 .

fermi Phys., Metro.
A unit of length used in nuclear physics. It is equal to 1.0 femtometer or 10-15m. It was named after the Italian-born US physicist Enrico Fermi (1901-1954).

fermion Phys.
Any particle that is subjected to the Pauli exclusion principle, that the particles cannot pass directly through each other. This means that the particles occur at different quantum states, in contrast to boson. All atoms and baryons are fermions and have half-integral quantum mechanical spin.

ferroelectricity Phys.
The retention of electric polarization by certain materials after the external field that produced the polarization has been removed.

ferromagnetic Phys.
Magnetic character of a material with a magnetic moment and with a large and positive value of magnetic susceptibility. The magnetic character is due to interaction of unpaired electrons which are well aligned within the material domains. Ferromagnetic is one of the strongest form of magnetism and is the basis for all permanent magnets. Examples of ferromagnetic materials are iron, cobalt and nickel.

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