Your brain shrinks as you age
It starts shrinking in your 30s or 40s, with the rate increasing after 60, but staying active, eating well, and consulting a doctor can help maintain brain health.
The hair around your belly button is responsible for catching lint
Belly button lint is caused by stomach hair trapping dead skin cells, clothing fibers, sweat, and oil, with men being more affected due to having more hair in that area.
Tattoos don t live on your skin, they live in your immune system
Tattoo ink resides in microscopic pores under the skin, triggering an immune response where white blood cells combat the ink as a foreign substance, adapting to future tattoos.
Your DNA shares its sequence with animals and most of it isn t human
Humans have acquired DNA from retroviruses and share 96% of their genes with primates, and even 50-70% with bananas and slugs, with only 0.1% of the genome differing between individuals
Your strongest and most emotional memories are often fake
Memories are reconstructed and can be inaccurate, with details filled in by the brain, often leading to embellished or incorrect recollections.
You cannot smell when you re in the dreaming phase
During REM sleep, when dreams occur, the sense of smell is inactive, though partially waking and smelling something can bring you out of a dream.
Your left and right lungs are different
The left lung has 2 lobes and is smaller to accommodate the heart, while the right lung has 3 lobes, with human lungs containing over 300 million alveoli and 1,500 miles of airways.
The fastest muscle in your body is the eye
Eye muscles move quickly in all directions, facilitating fast responses and reflexes, with blinking occurring 15-20 times per minute to keep eyes moist and clean.