I have a PhD in physics. I love to help.

386,890 students helped
Teaching the World! Champion! Collaborator! Trophy Case! Bold Learner! On Fire! Friendly Face!
Level 10 in Calculus Level 9 in Algebra Level 9 in Physics Level 8 in Astronomy Level 7 in Trigonometry Level 6 in Astrophysics Level 5 in Precalculus Level 5 in Chemistry Level 5 in English Grammar Level 4 in Psychology Level 4 in Statistics Level 4 in Earth Science Level 4 in Biology Level 4 in World History Level 4 in U.S. History Level 3 in Socratic Meta Level 2 in Organic Chemistry I Level 2 in Geometry Level 2 in Anatomy & Physiology Level 1 in Prealgebra