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For those wondering what Temple is? READ BELOW 👇🏻 👇🏻
Deepinder Goyal just dropped that golden patch photo and everyone is either memeing or confused.
Let me save you the scroll and explain exactly what Temple is, how it actually works, and why this might be the most important consumer health device ever built.
The device is a small oval wearable you stick on your temple.
It continuously measures real-time cerebral blood flow: exactly how much oxygenated blood is reaching your brain tissue right now.
It does this using near-infrared spectroscopy (NIRS), the same technology ICUs use to monitor brain oxygen in coma patients and during open-heart surgery.
Near-infrared light passes harmlessly through the thin temporal bone, bounces off the blood in your brain, and measures oxygen saturation + total blood volume.
Hospitals trust this tech with lives. Temple just made it tiny, beautiful, and consumer-grade.
Why the temple specifically? Because the bone there is paper-thin (thinnest part of the entire skull), and the superficial temporal artery is literally pulsing right under the skin, carrying blood straight up to the brain.
It's the perfect window. Your finger pulse oximeter works for the same reason: thin tissue = clean signal.
Now the big idea behind it: Gravity Aging Hypothesis
Deepinder's core belief is that gravity is quietly killing our brains over decades.
We are the only animals that walk fully upright 16 hours a day.
Gravity is constantly pulling blood downward, so your heart has to fight uphill to feed the brain.
When you lie down at night, gravity stops opposing you and brain blood flow instantly jumps 10–20%.
This is why you wake up sharper after good sleep, and why old people nap constantly: lying flat is the only reliable way their ageing heart + stiff arteries can properly perfuse the brain.
As we age, arteries stiffen, heart weakens a bit, neck posture collapses forward (text neck = longer distance against gravity), and that small daily deficit compounds.
The result is chronic mild under-perfusion of the brain.
This isn't some wild theory: poor cerebral blood flow is the strongest predictor of cognitive decline, Alzheimer's, Parkinson's, depression, brain fog, everything.
Interestingly, all these diseases hit the upper parts of the brain (cortex) harder than the lower parts exactly where gravity pulls blood away hardest.
Exercise feels magical because for 30–60 minutes your heart finally overpowers gravity and floods the brain.
Deepinder's question: what if most of the cognitive + mood benefits of exercise are just temporarily fixing our broken upright posture problem?
Temple's vision
It's the first true "heart rate monitor for your brain".
You get a live cerebral perfusion score. When it drops, the app doesn't nag you to meditate.
It gives actionable fixes:
"Stand up and do 20 jumping jacks"
"Lie down flat for 10 minutes"
"Do shoulder stands / inversion"
"Your neck has been forward for 2.5 hours straight, fix posture now"
Future versions (already in development) will go beyond monitoring.
They'll actively fix low flow using tiny electrical pulses or focused ultrasound to dilate local blood vessels on demand, exactly like hospital devices do, but automatically.
Think of it as a pacemaker for brain blood flow.
Even if the gravity theory turns out only 30% right, continuously knowing your brain perfusion is still revolutionary.
We monitor heart rate, blood oxygen, glucose, sleep, but literally no consumer device has ever measured how well the brain itself is being fed until now.
Funding isn't vibes: $50M seed from the exact same investors (Steadview, Peak XV, Vy Capital, etc.) who backed Zomato when it was just an idea.
Deepinder has been wearing prototypes publicly for months and wrote a 4000-word science post with references.
This isn't another wellness gimmick.
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