Black Hole Notes was created by a mother-daughter duo with over 30 years of combined experience teaching math and science in elementary, middle, high school and at the university level. Mathematics courses taught include: 3rd-7th grade mathematics, Pre-Algebra, Algebra 1, Algebra 2, Geometry, Pre-Calculus, Trigonometry, Calculus 1, 2 and 3 (some courses taught at the university level while others were taught at the elementary, middle and high school levels). We also have experience teaching science at the elementary & middle school level as well as high school biology and entry-level engineering courses at the university level.