Short answers, pulled from the story.
The oldest indirect evidence of stone tool use dates to 3.4 million years ago and was found as fossilized animal bones with tool marks in the Lower Awash Valley of Ethiopia. This discovery suggests that earlier hominins like Australopithecus or Paranthropus may have been the first toolmakers before the genus Homo fully emerged.
Mode 1 tools are simple pebble tools while Mode 2 tools are biface consisting of two concave surfaces intersecting to form a cutting edge all the way around. The Acheulean tradition of Mode 2 tools required more work and planning to manufacture compared to Mode 1 tools and became standard with Large Cutting Tools greater than 10 centimeters.
Innovation in the technique of smelting ore is regarded as the end of the Stone Age and the beginning of the Bronze Age. The first evidence of human metallurgy dates to between the 6th and 5th millennia BC in the archaeological sites of the Vinča culture in modern-day Serbia.
The Cave of Chauvet in the Ardèche department of France contains the most important cave paintings of the Paleolithic era dating from about 36,000 BC. The Altamira cave paintings in Spain were done between 14,000 and 12,000 BC and the hall of bulls in Lascaux dates from about 15,000 to 10,000 BC.
The first Neolithic cultures started around 7000 BC in the Fertile Crescent and spread concentrically to other areas of the world. The first large-scale constructions included settlement towers and walls like Jericho and ceremonial sites such as Stonehenge and the Ggantija temples of Gozo in the Maltese archipelago erected around 2500 BC.