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

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.