Washington: A small stone flake marked with intersecting lines of red ochre pigment some 73,000 years ago that was found in a cave on South Africa's southern coast represents what archaeologists on Wednesday called the oldest-known example of human drawing.The abstract design, vaguely resembling a hashtag, was drawn by hunter-gatherers who periodically dwelled in Blombos Cave overlooking the Indian Ocean, roughly 190 miles (300 km) east of Cape Town, the researchers said.It predates the previous oldest-known drawings by at least 30,000 years. While the design appears rudimentary, the fact that it was sketched so long ago is significant, suggesting the...