आपके BELLYBUTTON के अंदर क्या होता है? What is Inside Your BellyButton - AskGSF

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Hello, friends ever wondered...
1. What if we had two suns? Weird question, I know... But did you know, recently astronomers have found out that there are nearly 20 planets that revolve around 2 suns? Shocking, right?
2. How does a pulse oximeter determine the oxygen level in your blood without piercing your skin?
3. How did Eratosthenes measure the circumference of the Earth with just a stick? Wait, a stick? Are you kidding, how can this be possible?
4. What is behind your belly button/umbilicus? Well, what are you waiting for? Stay tuned to know more in our today's video.

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