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Tachyons are a putative class of particles which able to travel faster than the speed of light. Tachyons were first proposed by physicist Arnold Sommerfeld, and named by Gerald Feinberg. The word tachyon derives from the Greek (tachus), meaning “speedy.”

Henry is the unit of inductance. Inductance is a property of an electrical conductor which opposes a change in current. It does that by storing and releasing energy from a magnetic field surrounding the conductor when current flows, according to Faraday’s law of induction.

The photon is a type of elementary particle, the quantum of the electromagnetic field including electromagnetic radiation such as light, and the force carrier for the electromagnetic force.

Graphite is an electrical conductor, hence useful in such applications as arc lamp electrodes. It can conduct electricity due to the vast electron delocalization within the carbon layers (a phenomenon called aromaticity).

Vitamin C is found in citrus fruits and vegetables. Scurvy results from a deficiency of vitamin C in the diet.

The nervous system and the endocrine system regulate and coordinate body functions by sharing in a unique partnership. Jointly they maintain growth, maturation, reproduction, metabolism and human behavior.

Smallpox is transmitted from person to person via infective droplets during close contact with infected symptomatic people.

Galvanization or galvanizing is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanizing, in which the parts are submerged in a bath of molten zinc.

The strain is basically the ratio of two lengths, so it is a dimensionless quantity (a number that does not depend on the choice of measurement units).

Albert Einstein originally predicted the existence of gravitational waves in 1916, on the basis of his theory of general relativity.

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