1.   Take a piece of cheese and pull it on the edges. Does it pull apart? Eat it!

2.  Get another slice of cheese. Use your fingernail to make a cut parallel to the edge of the cheese slice.

3.   Pull on the edges of the cheese parallel to the cut. You’ll be pulling at right angles to the cut. Watch how the small cut you have made in the cheese slice concentrates the tearing. Look at the shape of the fracture. It multiplies at the tips where the tearing is taking place. The fracture tips move faster as the fracture gets bigger. Eat the cheese!

4.  Get another slice of cheese. Make 2 cuts near the middle of the cheese about 2.5cm apart. Make the cuts so they are balanced diagonally from each other.

5.   Pull the cheese. Now you have made a fault. The tips of the faults begin to multiply and curve inward and link into a single fault line.