Final answer:
A major discovery of early humans in the Paleolithic era was the creation and use of tools and the development of early art forms like cave paintings. These innovations were essential to their survival and societal development.
Step-by-step explanation:
A major discovery of early humans in the Paleolithic era was the creation and use of tools. These early tools were made from a variety of materials, including stone, wood, bone, antler, ivory, and bone, marking the advent of human technology. They facilitated food preparation and other crucial survival tasks. Other significant achievements included the development of art forms such as cave paintings and sculptures, which are among the earliest known examples of representational art. Additionally, hunter-gatherer societies of this time developed practices such as clothing and sophisticated shelter construction, which were integral to their adaptation and advancement.