Phil Edwards was a senior producer for the Vox video team. In most old photos — those taken in the 19th century and early 20th century — people aren’t smiling. That’s led to the popular ...

Seniors across Des Moines Public Schools celebrated Graduation Day. Check out their photos from the commencement ceremonies.

But by the post World War II period, people were openly grinning in their yearbook photos. The data suggest that in today’s yearbooks, men are smiling about as intensely as they did in the ...

Do you have a question about history? Send us your question at history@time . com and you might find your answer in a future edition of Now You Know. The first photographs were taken in the late ...

We've all seen images online that make us smile, but now there's a scientific formula of what makes a truly happy picture. A contest to find the world's happiest photograph threw up suggestions of ...