"An excellent website about Math and Physics with lessons and exercises. Discovered since I moved to Italy. For now I use it with the help of Google Translate, but as i'm still learning Italian I try to study on the website in its native language.\r\nFormulas are written in LaTeX, which is very important for a math-website.\r\nContents are well-rounded, written by trusted authors (mathematicians and physicists) and cover huge variety of topics."