For the past few years, because of my interest in The Great Span of human history, I’ve been tracking the last remaining people who were alive in the 1800s and the 19th century. As of 2015, only two women born in the 1800s and two others born in 1900 (the last year of the 19th century) were still alive. In the next two years, three of those women passed away, including Jamaican Violet Brown, the last living subject of Queen Victoria, who reigned over the British Empire starting in 1837.

Time exists on a much shorter scale than most people realize until they think about it. Stonehenge was built only 100 or so human lifetimes ago, assuming a 65-70 year median human life.