Examlex
________ solids consist of atoms or molecules held together by dipole-dipole forces, London dispersion forces, and/or hydrogen bonds.
Certain Knowledge
Knowledge that is absolutely sure, indubitable, and beyond any possibility of doubt.
Descartes
René Descartes, a French philosopher, mathematician, and scientist, known for his statement "Cogito, ergo sum" (I think, therefore I am).
Astronomical Theory
A scientific theory or set of principles that aims to explain phenomena observed in astronomy, such as the motions of celestial bodies or the evolution of the universe.
Sunset
The time in the evening when the sun disappears below the horizon.
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