Glossary

=Glossary of Terms and Concepts=

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 * Gravity:** Gravity is the force that pulls two objects toward each other.


 * Helix:** A helix is a curve that is shaped like a spring.


 * Median:** The median of a set of numbers is the value that has half the set less than it and half the set greater than it.


 * Tessellation:** Tessellations are patterns created by different shapes that can be placed next to each other without overlapping or leaving any gaps between the pieces. The pieces do not need to be all oriented the same way. Tesselations can be created using any one shape, or any finite number of different shaped pieces.


 * Vinculum:** This is the horizontal line that is drawn in a fraction or in a radical number, such as a square root. The vinculum implies parentheses around the parts for determining the order of operations.