The Bodelune Journal
Stories from inside the body
Short, fact-checked reads about how your body works, plus simple guides for better rest. Every article lists its sources.
Your Body Glows in the Dark, Just Too Faintly to See
Japanese scientists photographed real visible light coming from the human body. It is about 1,000 times too weak for our eyes.
Does Your Brain Clean Itself While You Sleep? Scientists Disagree
A famous 2013 study said sleep flushes waste out of the brain. A 2024 study found the opposite in mice. Here is where the…
How Fast Do Your Nails Grow? Fingernails Win the Race by Far
Fingernails grow about 3.5 mm a month, more than twice as fast as toenails. Here is what a study of healthy young adults found.
Why Do We Hiccup? A Study of Newborn Babies Offers a Clue
A hiccup is a sudden jump of your diaphragm and a quick shut of your throat. Research on newborns suggests hiccups may help a…
How Much of Your Body Is Water? The Answer Changes From Organ to Organ
About 60% of an adult body is water, but your lungs, brain and even your bones each hold a very different amount.
Why Do Your Fingers Wrinkle in Water? It Is Not What You Think
Pruney fingers are not just soaked skin. Your nervous system creates them on purpose, and they may help you grip wet things.
How to Choose a Sleep Mask: A Simple Guide
Contoured or flat, silk or foam, for travel or every night. A clear, simple guide to finding a sleep mask you will actually want…
Why Do We Yawn? The Brain-Cooling Theory Explained
It is not about oxygen. One leading theory says a yawn works like a radiator for your brain. Here is what the research shows,…
Your Body Makes About 4 Million New Cells Every Second
Scientists counted how fast the human body replaces itself: about 330 billion cells a day. And no, you are not a completely new person…
Why Do We Get Goosebumps? Scientists Found a Surprising Answer
Goosebumps look like a useless leftover from our furry ancestors. A Harvard study found they are wired to the stem cells that grow new…
What Happens to Your Body If You Don’t Sleep for 24, 48 and 72 Hours?
One missed night already affects you like alcohol does. Here is what science says happens hour by hour, and why one good sleep usually…