##### Why Do Rivers Meander?
Rivers twist and turn as they make their way to the sea. Why does this happen and how can this be explained mathematically? In this module we look at the geometry of meandering rivers. In the process we'll discover some fascinating numerical relationships. Go to https://media4math.com/M4M-modules to see all Classroom Modules.
##### Why Do Elephants Have Wrinkled Skin?
Have you noticed how wrinkled an elephant's skin is? What purpose does it serve and what does math have to do with explaining this phenomenon? Well, the explanation for an elephant's wrinkled skin is almost entirely a math story.  Go to https://media4math.com/M4M-modules to see all Classroom Modules.
##### Applications of Linear Functions: Circumference vs. Diameter
As the size of a circle changes, so does the size of the diameter and that of the circumference. In fact, there is a linear relationship between these two measures. This relationship can be modeled with a linear function. In this module students will study this linear function and examine its properties, including the fact that the slope of this function is π itself. Go to https://media4math.com/M4M-modules to see all Classroom Modules.
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##### Reflection and Symmetry: Da Vinci's Mirror Writing
In this module explore reflection and symmetry in the context of Leonardo Da Vinci's mirror writing. Many of Da Vinci's handwritten notes were written in reverse script that could only be read correctly in a mirror. This provides an opportunity to explore geometric reflections, but also the symmetric properties of certain letters of the alphabet. Go to https://media4math.com/M4M-modules to see all Classroom Modules.