John Freely: Air

“John Philoponus (c. 490-570) of Alexandria… refuted Aristotle's theory that the velocities of falling bodies in a given medium are proportional to their weight, making the observation that "if one lets fall simultaneously from the same height two bodies differing greatly in weight, one will find that the ratio of the times of their motion does not correspond to the ratios of their weights, but the difference in time is a very small one." …He also criticized Aristotle's antiperistasis theory of projectile motion, which states that the air displaced by the object flows back to push it from behind. Instead Philoponus concluded that "some incorporeal kinetic power is imparted by the thrower to the object thrown" and that "if an arrow or a stone is projected by force in a void, the same will happen much more easily, nothing being necessary except the thrower."”

John Freely

This is the famous "impetus theory," which was revived in medieval Islam and again in fourteenth century Europe, giving rise to the beginning of modern dynamics.
Source: Before Galileo, The Birth of Modern Science in Medieval Europe (2012), p. 8

Time

“Empedocles tried to address the problem of change by saying that there is not one fundamental arche but four—earth, water, air, and fire—which generate all the material substances in nature by mixing together in various ways under the influence of forces he called Love and Strife.”

John Freely

Source: Before Galileo, The Birth of Modern Science in Medieval Europe (2012), p. 287

Love , Way , Nature , Problem

“Newton's proof of the law of refraction is based on an erroneous notion that light travels faster in glass than in air, the same error that Descartes had made. This error stems from the fact that both of them thought that light was corpuscular in nature.”

John Freely

Source: Before Galileo, The Birth of Modern Science in Medieval Europe (2012), p. 189

Law , Travel , Error , Nature