Determining the water content of a sample of soil Animation Play

Direct proportion Whiteboard exercise Play

Discovery of elementary particles Whiteboard exercise Play

Discovery of elementary particles Student activity Play

Discriminant of the equation ax 2 + bx + c = 0 Student activity Play

Dividing 450 euro into three parts Whiteboard exercise Play

Dividing a line segment Student activity Play

Dividing into a given ratio Student activity Play

Dividing quantities in a given ratio Whiteboard exercise Play

Dividing quantities in a given ratio Student activity Play

Dividing segments in a given ratio Whiteboard exercise Play

Dividing segments in a given ratio Student activity Play

Division into three parts in a given ratio Student activity Play

Division into three parts in a given ratio Animation Play

Division into two parts in a given ratio Student activity Play

Division of a segment Animation Play

Does a chemical compound have a constant composition? Student activity Play

Does a man attract the Earth? Student activity Play

Dry plant mass Illustration Play

During a thunderstorm Student activity Play

During a thunderstorm Whiteboard exercise Play

Dynamometer Simulation Play

Early atomic theories Student activity Play

Early atomic theories Whiteboard exercise Play

Early attempts to classify chemical elements Whiteboard exercise Play