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2017 Mass Shootings
Top events for the nation and the world in 2017 Prev Next Shooting at Republican Baseball Practice Gunman Targets Republicans at Congressional Baseball Practice On June 14, Republican…Convert Metric Units of Mass
In this video, Carlos learns how to convert between milligrams and grams.Worldwide School and Mass Shootings
From the deadliest shootings in history to the impact of gun violence on communities, this quiz will challenge your understanding of this pressing issue. Whether you're a concerned citizen or looking…critical mass
(Encyclopedia) critical mass: see chain reaction.mass extinction
(Encyclopedia) mass extinction, the extinction of a large percentage of the earth's species, opening ecological niches for other species to fill. There have been at least ten such events. The five…mass number
(Encyclopedia) mass number, often represented by the symbol A, the total number of nucleons (neutrons and protons) in the nucleus of an atom. All atoms of a chemical element have the same atomic…mass production
(Encyclopedia) mass production: see production.mass spectrograph
(Encyclopedia) mass spectrograph, device used to separate electrically charged particles according to their masses; a form of the instrument known as a mass spectrometer is often used to measure the…mass transit
(Encyclopedia) mass transit, public transportation systems designed to move large numbers of passengers. The history of mass transportation is intimately connected to industrialization,…atomic mass
(Encyclopedia) atomic mass, the mass of a single atom, usually expressed in atomic mass units (amu). Most of the mass of an atom is concentrated in the protons and neutrons contained in the nucleus.…Trending
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