How long are your eyes blanked out each day?

About two hours over a full waking day. Every time your eyes jump from one point to another, your brain mutes the visual signal. The mechanism is called saccadic suppression. Blinks add to it. Volkmann 1980 and Bristow, Frith, Rees 2005 documented both effects.

How many skin cells do you shed per day?

Roughly one billion epidermal cells per day, around forty thousand per minute. Skin-lipid measurements in household dust by Weschler et al. 2011 in Environmental Science & Technology confirmed that the bulk of indoor particulate is shed human skin.

Why does your heart rate change when you breathe?

The pattern is called respiratory sinus arrhythmia. The heart accelerates on inhalation and slows on exhalation through vagus nerve modulation. About ninety percent of healthy adults show the rhythm. Yasuma and Hayano 2004 in Chest reviewed the mechanism.

Do humans have mites on their eyelashes?

Yes. Demodex folliculorum and Demodex brevis are microscopic mites that live in human hair follicles, including the base of the eyelashes. A 2025 systematic review and meta-analysis on ScienceDirect placed adult prevalence at roughly one in three by middle age and approaching universal in the elderly. The mites feed on sebum and dead skin.

How many bacterial cells are in the human body?

Approximately 38 trillion bacterial cells for a 70 kg reference adult, slightly more than the 30 trillion human cells. Sender, Fuchs, Milo 2016 in PLOS Biology recalculated the older 10:1 ratio down to a tighter 1.3:1 ratio. By cell count, you are about 53 percent bacterial.

5 things your body did while you watched this video

Transcript

While you watched this video, five things happened to your body. You did not notice any of them.

One. Your eyes are blind for about two hours every day. Every time they jump from one point to another, your brain mutes the visual signal. The effect is called saccadic suppression. You're scrolling right now. You just missed seconds of footage. Your brain edited it out.

Two. You shed roughly one billion skin cells today. About forty thousand every minute. Most of the dust on your phone screen, on your desk, in your home? That is you.

Three. Your heart is not on a clock. It speeds up when you breathe in. It slows down when you breathe out. The pattern is called sinus arrhythmia. About ninety percent of healthy people have it. It is a sign your vagus nerve is working.

Four. Roughly one in three adults right now has microscopic Demodex mites living on their eyelashes. By age seventy it is closer to everyone. They eat your dead skin while you sleep.

Five. Your body contains roughly thirty eight trillion bacterial cells. That is more cells than your own. You are not a single organism. You are a moving ecosystem.

Which one freaked you out the most? Follow kuz.

Sources

Volkmann, F. C. (1980). "Saccadic suppression: A brief review." Behavioural Brain Research, 1(3), 261-279. And Bristow, D., Frith, C., Rees, G. (2005). "Two distinct neural effects of blinking on human visual processing." NeuroImage, 27(1), 136-145. Established that the brain actively suppresses visual input during both saccades (rapid eye movements) and blinks, blanking conscious perception for approximately two hours over a full waking day. Open source

Weschler, C. J., Langer, S., Fischer, A., Beko, G., Toftum, J., Clausen, G. (2011). "Squalene and cholesterol in dust from Danish homes and daycare centers." Environmental Science & Technology, 45(9), 3872-3879. Quantified skin-lipid loading in household dust, the chemical evidence behind the widely cited estimate that humans shed approximately one billion epidermal cells per day, dominating indoor particulate mass. Open source

Yasuma, F., Hayano, J. (2004). "Respiratory sinus arrhythmia: why does the heartbeat synchronize with respiratory rhythm?" Chest, 125(2), 683-690. Reviewed the mechanism by which the heart rate accelerates during inhalation and decelerates during exhalation, a vagally mediated reflex present in about ninety percent of healthy adults and a recognised marker of autonomic health. Open source

Global prevalence of Human Demodex Mite infestation: A systematic review and meta-analysis. ScienceDirect (2025). Pooled estimates across population studies placing adult prevalence of Demodex folliculorum and Demodex brevis at roughly one in three by middle age and approaching ubiquity in the elderly. The mites colonise hair follicles, including eyelashes, and feed on sebum and dead skin. Open source

Sender, R., Fuchs, S., Milo, R. (2016). "Revised Estimates for the Number of Human and Bacteria Cells in the Body." PLOS Biology, 14(8), e1002533. DOI: 10.1371/journal.pbio.1002533. Recalculated the human microbiome census, replacing the old 10:1 bacteria-to-cell ratio with a tighter 1.3:1 estimate. Approximately 38 trillion bacterial cells versus 30 trillion human cells for a 70 kg reference adult male. Open source

5 things your body did while you watched this video

Transcript

Sources

other things you've googled.

Does your phone listen to you?

Why do you forget why you walked into a room?

Do we only use 10 percent of our brain?

Why does time feel faster as you get older?

5 things your body did while you watched this video

Transcript

Sources

other things you've googled.

Does your phone listen to you?

Why do you forget why you walked into a room?

Do we only use 10 percent of our brain?

Why does time feel faster as you get older?

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