Causes of the periodicity of extinction and speciation Simulation Play

Domain and periodicity of trigonometric functions Whiteboard exercise Play

Domain and periodicity of trigonometric functions Student activity Play

Early attempts to classify chemical elements (1) Student activity Play

General solution for the sine Animation Play

General solution of a trigonometric equation Student activity Play

Mass speciation and extinction Student activity Play

Periodicity of extinction and speciation Slideshow Play

Reduction formulas due to periodicity Student activity Play

Reduction formulas due to periodicity Whiteboard exercise Play

The history of the periodic table Animation Play

The law of periodicity and the properties of elements Animation Play

The structure of the periodic table Student activity Play