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First recognized in 1900 by Max Planck, it was originally the proportionality constant between the minimal increment of energy, E, of a hypothetical electrically charged oscillator in a cavity that contained black body radiation, and the frequency, f, of its associated electromagnetic wave. In 1905 the value E, the minimal energy increment of a hypothetical oscillator, was theoretically associated by Einstein with a "quantum" or minimal element of the energy of the electromagnetic wave itself. The light quantum behaved in some respects as an electrically neutral particle, as opposed to an electromagnetic wave. It was eventually called the photon.

What did the light quantum behave the same as in laboratory experiments?
Answer: neutral particle
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The views of the Church Fathers still play an important role in the shaping of Orthodox Marian perspective. However, the Orthodox views on Mary are mostly doxological, rather than academic: they are expressed in hymns, praise, liturgical poetry and the veneration of icons. One of the most loved Orthodox Akathists (i.e. standing hymns) is devoted to Mary and it is often simply called the Akathist Hymn. Five of the twelve Great Feasts in Orthodoxy are dedicated to Mary. The Sunday of Orthodoxy directly links the Virgin Mary's identity as Mother of God with icon veneration. A number of Orthodox feasts are connected with the miraculous icons of the Theotokos.

What is name of the Orthodox hymn devoted to Mary?
Answer: the Akathist Hymn
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Occasionally a bisyllabic word is written with two characters that contain the same radical, as in 蝴蝶 húdié "butterfly", where both characters have the insect radical 虫. A notable example is pipa (a Chinese lute, also a fruit, the loquat, of similar shape) – originally written as 批把 with the hand radical, referring to the down and up strokes when playing this instrument, which was then changed to 枇杷 (tree radical), which is still used for the fruit, while the character was changed to 琵琶 when referring to the instrument. In other cases a compound word may coincidentally share a radical without this being meaningful.

What is occasionally written with two characters that contain the same radical?
Answer:
bisyllabic word