Observation and description of a phenomenon or group of phenomena. 2. Formulation of an hypothesis to explain the phenomena. In physics, the hypothesis often takes the form of a causal mechanism or a mathematical relation. 3. Use of the hypothesis to predict the existence of other phenomena, or to predict quantitatively the results of new observations. 4. Performance of experimental tests of the predictions by several independent experimenters and properly performed experiments.

Meteorites

x How a snowstorm explains Trump’s latest accusation of fake news by the New York Times

When President Trump picked up the New York Times Friday morning, he saw a story about his relationship with Chinese President Xi Jinping on the front page, above the fold

Sean Hannity used his Fox News show on Monday night to feed wild conspiracy theories that the protests erupting around the country weren’t a spontaneous display of anger against President Donald Trump. Instead, he implied they were “bankrolled” by shadowy figures.

Knowledge has been defined as "A clear perception of a truth or fact, erudition; skill from practice." Also "to know, viz.; To perceive with certainty, to understand clearly, to have experience of." On the other hand, Belief is an "Assent to anything proposed or declared, and its acceptance as fact by reason of the authority from whence it proceeds, apart from personal knowledge; faith; the whole body of tenets held by any faith; a creed; a conviction."