This viral optical illusion challenges you to spot an inverted number 39 hidden among inverted 63s in just 6 seconds. The ...

Richard Fishacre challenged the scientific orthodoxy of his day, and contemporary astrophysics has vindicated his position.

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Over many years of geological time, opal is slowly formed as many small spheres of silica (what glass is made of) ...

Abstract: As complementary to the imaging of primaries, multiples can be used for imaging and produce additional angular illumination. These additional illumination angles can improve imaging ...

Abstract: The expressions and properties of the critical angles of nonuniform plane waves for determining the correct refraction angle at the infinite planar interface of two linear, isotropic, and ...