Math & Science
Help with math, chemistry and physics, plus free tools.
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How to Study and Pass Biology
Five tips for studying and passing biology: master the terminology, learn your course's key terms, see the connections, read daily and study old exams.
ReadGoogle Calculator: An Advanced Guide
Learn the basic and advanced commands of the Google Calculator, with worked examples, unit conversions and built-in mathematical constants.
ReadWhere Is the Missing Dollar? A Classic Math Riddle
Three diners, a $30 bill and a waiter who pockets $2: where did the missing dollar go? Try to solve this classic math riddle before reading the answer.
ReadDoes 2 Equal 1? A Classic Algebra Puzzle
A step-by-step algebraic "proof" that 2 equals 1. Follow each line and see if you can spot the mistake hidden in this classic math puzzle.
ReadGeoGebra: Dynamic Math Software for Geometry, Algebra and Calculus
GeoGebra is dynamic math software that links geometry, algebra, spreadsheets and calculus so you can explore and manipulate objects interactively.
ReadHow to Study History
History doesn't have to be boring. Learn the two things history teachers focus on most, the causes of an event and its consequences, and how to study them.
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