This video is the second episode of a series titled "Answers that you have always wanted to know." The host starts by thanking viewers for their questions from the previous episode, which totaled over 60,000.
The video covers a range of topics, including:
- The science behind seeing images and lights when our eyes are closed. According to the video, our vision system remains active, allowing neurons in the cerebral cortex to form images. These images are called "phosphenes" and are completely normal. When the eyelids are tightly closed, small dots and flashes of color appear due to increased pressure in the eyeball.
- The largest planet in the Milky Way, recently discovered as 2011, which is 2500 times larger than Earth and located 25 thousand light years away.
- The role of cats' ears in balance and their ability to react quickly due to their flexible spine.
- The misconception that gravity doesn't act underwater and the truth that it's the same throughout our planet, but bodies fall slower in water due to its higher density.
- The invisibility of air because it's a mixture of colorless gases.
- The rudimentary communication of animals through sounds, smells, and actions.
- The number of balloons needed to make a person, a house, and a building fly up, which is approximately 5000 balloons for a person, 3,000 to 500,000 balloons for a shopping center, and 10 million to 10 billion balloons for a building.
- The color of a mirror, which is green due to its ability to reflect green light slightly more than other colors.
- The phenomenon of skin turning white when pressed, which is due to the blocking of blood flow to the area.
- The comparison between the number of stars in the universe and grains of sand on Earth, with the former being estimated at 70 billion trillion trillion times more.
The video ends with a reminder to leave questions for the next episode in the comment section.
1. The video is the second episode of a series called "answers that you have always wanted to know".
2. In the previous video, viewers left more than 60,000 questions.
3. Juan Martínez and Mariana Vitoria ask why we see images and lights when we close our eyes.
4. When we close our eyes, our vision system remains active and the neurons in the cerebral cortex responsible for forming images continue working.
5. We see lights and geometric shapes according to the shape of our cornea, these figures are called phosphenes and are completely normal.
6. When we close our eyes and squeeze our eyelids tightly, we see small dots and flashes of color due to the increase in pressure in the eyeball.
7. Agustín Rodríguez, a gamer, asks what is the largest planet in the milky way.
8. Recently, a group of astronomers discovered a planet called 2011 which is 2500 times larger than the earth and 8 times larger than the most planet in our solar system, Jupiter.
9. Ara hai Pérez asks why cats are always compared to their balance and ear.
10. Eric Bryant Bedoya asks why we float when we are under water.
11. Gravity is the same throughout our planet, the only thing that happens differently is the fall of bodies in water.
12. A human body has approximately the same density as water but still most of the time floats because our lungs are full of air.
13. A user asks why we cannot see air, air is a mixture of gases and since the vast majority of them are colorless, we cannot see them.
14. Merlo Fido asks if animals can talk to each other, they can communicate with their own species through sounds, smells and actions.
15. Miguel Gamer asks how many balloons it takes to make a person, a house and a building fly up.
16. One liter of helium has the capacity to lift approximately one gram of weight.
17. To lift a person into the air, you will need approximately 5000 balloons.
18. If you wanted to elevate a building, depending on its size, you would need between 10 million and 10 billion balloons.
19. Rocio Gauto asks why when we press on our finger the nail turns white.
20. Your skin is full of nerve endings and capillaries which, when pressed, prevent blood flow.
21. Luis Jiménez asks if there are more stars in the universe or grains of sand in the world.
22. It is estimated that there are 10 times more stars in the night sky than grains of sand in the world's deserts and beaches.
23. If a universe can fit in one drop of water, then perhaps everything we know can be contained in a drop of cosmic water.