diff --git a/User-Stories.md b/User-Stories.md
new file mode 100644
index 0000000..b044fa1
--- /dev/null
+++ b/User-Stories.md
@@ -0,0 +1,7 @@
+Brief summaries of activities one might try/problems one might solve with dyna3.
+
+- The cannonball shipping problem from the Playground in Math Horizons.
+
+- A slightly farfetched one: put three or more "pins" in a plane (or in space). Constrain an additional point in the plane as the "pencil" such that the length of a string looped around the pins and the pencil in some way (there are multiple configurations) has constant length. Find the locus of positions of the pencil. (Generalizations of ellipse-drawing.)
+
+- Somewhat less farfetched, another natural generalization of ellipse-drawing: find the locus of a point P such that the surface area of tetrahedron ABCP is a constant. (In the plane, an ellipse is the locus of a point P such that the perimeter of ABP is constant.)