London is a city with a rich history spanning many centuries. Over the years, different towns, previously not part of the capital, have expanded and stitched themselves together to form the metropolis we know today. London is an early instance of...

If you’re an American over the age of 25, you may remember chickenpox -- formally known as the varicella zoster virus -- as an inevitable rite of passage. As the Center for Disease Control has written: “Before the availability of varicella...