Knowledge is fundamentally a matter of inference, but there are some cases in which we can be relatively certain of knowledge. Examples of this would include hard facts gathered through empirical observation and mathematical or logical reasoning that is necessarily true. For example, every time we lift a heavy object, the law of gravity states that it will fall back to the ground unless held up. This is an immutable law that can be known with some degree of certainty. Even in such cases, however, our understanding can still be informed by probability and inference; for example, we can be reasonably certain that an object will remain suspended in air if a complex network of ropes and pulleys is used to support it, but there is still an inherent degree of uncertainty in how the process will work.
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Knowledge is fundamentally a matter of inference, but there are some cases in which we can be relatively certain of knowledge. Examples of this would include hard facts gathered through empirical observation and mathematical or logical reasoning that is necessarily true. For example, every time we lift a heavy object, the law of gravity states that it will fall back to the ground unless held up. This is an immutable law that can be known with some degree of certainty. Even in such cases, however, our understanding can still be informed by probability and inference; for example, we can be reasonably certain that an object will remain suspended in air if a complex network of ropes and pulleys is used to support it, but there is still an inherent degree of uncertainty in how the process will work.