Thinner plastic allows the soil to heat up better but also tears more easily. Use plastic with a thickness of 1 to 4 mils for best results. Fill in the ditch around the perimeter with soil to hold the plastic in place. You may also wish to add rocks to the edges to help hold down the plastic.
The didgeridoo is a wind instrument traditionally made from the trunk of termite hollowed eucalyptus trees from Australia (like the one pictured at left, which is being played by our mate Lewis Burns).
Progeria, also known as HGPS (Hutchinson-Gilford Progeria Syndrome), is an extremely rare genetic condition. The word Progeria comes from the Greek progeros meaning 'prematurely old'.