Smallpox, a deadly virus causing severe fever and skin rashes, claimed the lives of 3 in 10 people by the early 20th century. Survivors were often left with permanent scars. The variola virus caused smallpox, but a vaccine using a related but safer virus, vaccinia, was developed. This vaccine stimulated […]

Take a step back in time and immerse yourself in the captivating moments of the 1960s, a decade marked by monumental events that shaped history. From the Civil Rights Movement to the Vietnam War, from the iconic Woodstock Music Festival to the tragic assassination of John F. Kennedy, the 1960s […]

There’s something fascinating about the way optical illusions and other mind-bending images almost distort your brain. There are hundreds of such pictures on the internet and in old books — but this one comes from real life. There’s an “invisible” being in this picture, but it’s not a sneaky intruder […]