The 19th-century English polymath Herbert Spencer defined science as organized knowledge, which is as good a definition as any. Gathering, organizing, and sharing information — these actions are as old as the curious human mind. Older, actually, than the curious human mind, since evidence from the archaeological record suggests that early, pre-homo sapiens hominids learned and passed down important skills, like how to control fire and how to create stone tools.
Today’s scientific understanding of the universe is hypercomplex. This is true at the macro level with the mind-bending rules of general relativity, and it’s even truer at the quantum level with the completely counterintuitive rules of quantum mechanics.