A superconductor is a material that achieves superconductivity, which is a state of matter that has no electrical resistance and does not allow magnetic fields to penetrate. An electric current in a superconductor can persist indefinitely. Superconductivity can only typically be achieved at very cold temperatures. https://canhrau.com/wp-content/uploads/2022/04/nhung-hinh-anh-phong-canh-dep-nhat-hinh-2-2048x1280.jpg

 Bài viết này khiến mình cảm thấy vui vẻ và lạc quan hơn!  Thương quá!