Add Yahoo as a preferred source to see more of our stories on Google. Thousands of years ago, our ancestors discovered something that would clean their bodies and clothes. As the story goes, fat from ...

(The Conversation is an independent and nonprofit source of news, analysis and commentary from academic experts.) Curious Kids is a series for children of all ages. If you have a question you’d like ...

Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to CuriousKidsUS@theconversation.com. How does soap clean our bodies? – Charlie H., ...

(The Conversation is an independent and nonprofit source of news, analysis and commentary from academic experts.) Paul E. Richardson, Coastal Carolina University (THE CONVERSATION) Advertisement ...