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

"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 ...

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

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