"Human experience of space and time in the physical world." This chart illustrates that humans perceive only a tiny slice of the full universe. The large striped box represents everything that exists—from the smallest subatomic particles to the vast reaches of outer space, and from the briefest instants to the entire age of the cosmos. At the center, the small white square labeled “Human Experience” marks the narrow range of sizes and time scales we can directly sense, like the dimensions of a room or the span of a human lifetime. It highlights how most of reality lies beyond our perception—either too small, too immense, too fast, or too slow for our senses—leaving us with a very limited window into the true scope of the universe.(Historic Vids)