this is khan academy's video

Bro, add some bright thumbnails and unique ones, upload videos based on most searched topics, and you will progress soon 😉 If possible, add one of your photos to make the thumbnail more interesting

i can't see the outer most borders of the displayed screen. But thanks for the nice explanations!

Hi , I'm 23 years old with a myopia of -3.00 and (-1) astigmatism in both eyes. Can I often take off my glasses to read my smartphone or read a book for hours every day without worsening my myopia or astigmatism for the long-term ? 🙏