Part 2/10:
The origins of quantum mechanics arose from observational evidence, primarily through experimentations that yielded visual data, akin to photographs. John Bell, a noted physicist, indicated that the fabric of quantum mechanics was woven from results that could be described in classical terms: visual representations showing structures that conveyed behavior typically associated with classical physics. Indeed, one significant piece of evidence was identified in the form of tracks produced in cloud chambers, which were pivotal in demonstrating the reality of particles like cosmic rays.