Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
타키온은 빛보다 빠르게 이동할 수 있는 가상의 입자입니다.takion-eun bichboda bappeuge idonghal su itneun gajang-ui ibja-imnida.A tachyon is a hypothetical particle that can travel faster than light.