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| Authority- An accepted source of expert information or advice. |
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| Intuition- The act or faculty of knowing or sensing without the use of rational processes it involves immediate cognition. |
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| Reason- The capacity for logical, rational, and analytic thought telligence. |
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| Sensory data- Knowledge obtained through the senses. |
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| Hypothesis- A tentative explanation for an observation phenomenon, or scientific problem that can be tested by further investigation. |
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| Theory- A set of statements or principles devised to explain a group of facts or phenomena, especially one that has been repeatedly tested or is widely accepted and can be used to make predictions about natural phenomena. |
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| Law- A well tested theory so firm as to be unquestioned by science. |
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| Model- A schematic description of a system, theory, or phenomenon that accounts for its known or inferred properties and may be used for further study of its characteristics. |
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| Existence- The fact or state of having actual or real being. |
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| Causality- Cause must always precede the effect. |
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| Time Symmetry- The laws of the universe do not change with time |
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| Principle of noncontradiction- Of tow contradictory propositions both cannot be true. |
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| Occam's razor- Simpler explantions are more likely to be true than complex ones. |
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| Position symmetry- The laws of the universe are not differnt at different locations. |
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| Interaction- Any of four fundamental ways in which elementary particles and bodies can influence each other. |
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| Force- A push or pull on an object |
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| Strong Nuclear Interaction- the interaction between nucleons that gives rise to the strong force. |
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| Electromagnetic Interaction- The interaction between charged objects that gives rise to the electromagnetic force. |
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| Weak Nuclear Interaction- The interaction between nucleons that gives rise to the weak force. |
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| Atomic nuclei- The positively charged central region of an atom, composed of protons and neutrons. |
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| Proton- A composite strongly interacting particle made up of three quarks. Protons carry a positive electrical charge and is a constituent part of the nucleus of atoms. |
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Neutron- A composite, strongly interacting particle made of three quarks, but which carries no net electrical charge. Neutrons are a constituent part of the nucleus of atoms.
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| Necleon- A generic name for either a proton or a neutron. |
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| Quark- The elementary particles of which protons and neutrons consist. A proton and a neutron each consist of three quarks. |
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| Electron- An elementary particle in atoms having a negative charge. Electrons are located outside atomic nuclei. |
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| Element- A substance composed of atoms that have an identical number of protons in each nucleus. Elements cannot be reduced to simpler substances by normal chemical means. |
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| Atom- The fundamental unit of an element. |
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| Molecule- A microscopic structure usually made up of more than one atom. |
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| Solar System- The sun and all planets, comets, asteroids, and other bodies that orbit about it under the pull of gravity. |
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