Welcome to the world of the possible and the impossible.
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Quasicrystal is a structure that is ordered but not periodic. A quasicrystalline pattern can continuously fill all available space, but it lacks translational symmetry. While crystals, according to the classical crystallographic restriction theorem, can possess only two-, three-, four-, and six-fold rotational symmetries, the Bragg diffraction pattern of quasicrystals shows sharp peaks with other symmetry […]
Brainstem is the posterior stalk-like part of the brain that connects the cerebrum with the spinal cord. The brainstem is very small, making up around only 2.6 percent of the brain’s total weight. In the human brain the brainstem is composed of the midbrain, the pons, and the medulla oblongata. The midbrain is continuous with […]