![Popular Science Radio show](https://d3dthqtvwic6y7.cloudfront.net/podcast-covers/000/031/052/small/popular-science-radio.png)
Summary: In honor of World Population Day, Population Connection has put together a list of the top five inventions that have changed population history. From the microscope to oil wells, Population Connection's Pam Wasserman explains how each of these inventions came to be so influential.