If you tried to sum up the last 150 years or so in one image, a chart of exponential growth would be a good place to start. It shows that some things change faster over time. You could apply it to life expectancy. Or compound interest....

Paul Andersen explains the importance of selection in biology. Artificial selection occurs when humans choose traits that will be selected for or against. This has created the variety of domesticated animals and crops. He then...

Here at Step Back we have been focusing on historical events that do not lean on singular important people to understand. Often, historians tend to overemphasize the roles of individuals in the overall course of humanity. But hell, I...