Deepinder Goyal built an app that fed Indians. With Temple, can he fix how they age?

Deepinder Goyal, the founder of Zomato, has a new startup. It's called Temple — a wearable that tracks blood flow in your brain. His theory is that improving that flow could slow down aging. Doctors aren't convinced. Investors seem to be.

Temple is valued at 190 million dollars. The science behind it hasn't been peer reviewed. And India has a rapidly aging population that could genuinely use some answers.

So who exactly is this for?

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