Without our immune system, we wouldn't last very long: this complex network of organs and cells fights off pathogens and ...

In 2017, at the age of 70, Donald Trump first became the oldest president to be inaugurated, surpassing Ronald Reagan, who ...

What's with all the rules about lithium batteries on flights? Here's the answer to that, and more common travel questions.

"For example, if you are a male and your donor is a female and you do a blood DNA test your results will show that you are a ...

Which president had the longest inaugural address? Which has been sworn in the most? Which ended the ceremony’s top-hat ...