Universal History Archive / Universal Images Group via Getty Images 4.The photo below, taken in 1852, is of Conrad Heyer, a Revolutionary War veteran who was 103 years old when it was taken.

The complexity of the human brain—86 billion neurons strong with more than 100 trillion connections—enables abstract thinking, language acquisition, advanced reasoning and problem-solving, and ...

With TimeMap.org, you can do just that—no time machine required. This interactive history map lets you dive into the past, offering a unique way to see when, where, and how historical events ...