Roman, Egyptian, and Chinese civilizations had many different ingenious inventions. Chocolate was a big aphrodisiac for Mesoamerican civilizations and used for energy. The first earthquake detector is ...

Add Yahoo as a preferred source to see more of our stories on Google. Making the jump from using symbols to writing is considered a major development in human cognitive abilities. Tracing how and when ...

(The Conversation is an independent and nonprofit source of news, analysis and commentary from academic experts.) Serdar Yalçin, Macalester College (THE CONVERSATION) The earliest form of the ...