Why People Are Never Smiling in Old Photographs

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March 6, 2025

The Baby Boom caused a nationwide diaper shortage.

History Facts Why People Are Never Smiling in Old Photographs It wasn't just bad teeth. There's a fascinating reason behind those serious faces. Read More Travel and Leisure You Never Want To See These Four Letters on Your Boarding Pass Unfortunately, this code could slow down your airport security experience.  →

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What function do mitochondria serve in a cell? (Scroll down to see the answer)

Mental Floss How NASA Helped Solve a Murder In 1989, the space agency had better imaging technology than the FBI.  →

Scientific American Do People Actually Swallow Spiders in Their Sleep? It has long been said that sleeping humans swallow an average of eight spiders a year.  →

How Stuff Works What Are Imaginary Numbers? Imaginary numbers seem confusing, but the concept gets easier to grasp when you relate them to negative numbers.  →

BBC Why Playing Games Is Good for You People with playful traits are more motivated and creative, according to studies. But why do most of us stop playing games as adults?  →

Provide energy to the cell

There's always more to know.

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