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Moment of truth
The word 'nanotechnology' is first coined by University of Tokyo researcher Norio Taniguchi back in 1974.

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Local Group Astron.
The small galaxy group that includes the Milky Way Galaxy (our galaxy), the Andromeda Nebula, and about 20 other smaller galaxies. These galaxies cluster together and the motions are interacted strongly by the combined gravitational effects, predominantly, due to the Milky Way and the Andromeda Galaxy (M31). The Group occupies a volume of about 10 million light years in diameter and centered at a region somewhere between the Milky Way and the Andromeda Galaxy. Other members include the Triangulum Galaxy (M33), satellites of Andromeda Galaxy - M32 and M110, the Magellanic Clouds, etc.

Lorentz invariance Phys.
Synonymous to the principle of relativity, which is a law states that the laws of physics are the same for all observers moving at constant velocity relative to each other. For example, the light carrier, photons, all travel at the speed of light.

Loschmidt's number Chem.
The number of an ideal gas particles per unit volume at standard temperature and pressure of 0c and 1 atmosphere. It has a value of 2.68719 x 1023 m-3 and was first determined by Johann J. Loschmidt (1821-1895), an Austrian chemist.

Lou Gehrig's disease Med.
A neurodegenerative disease, named after the famous baseball player, Lou Gehrig, in the United States. He died from the disease in 1941, two years after the disease was diagnosed. See amyotrophic lateral sclerosis for more details.

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