What kind of work does Stephen do?

Where is helium the gas found in its normal state? Give the name of the continent or country in the frigid zone? The mitochondria are? Who have concluded that the volcanic eruption caused a tidal wave? What electrical safety device has a piece of metal that melts when a current becomes too strong? What happens to your body if the endocrine system fails? Do hot spots create or destroy oceanic or continental crust? What is the name of the 2 gases that make up the gas giants? Is lassi homogeneous mixture? What does water and wind have to do together? What is seeding process? Is a jagged bolder a rock? How is ozone layer depleted in nature? Why were James Watson and francis crick given the credit for the discovery of DNA structure? Fusion reactions in the Suns core will continue forever and go on with no end? 7 grams equal to how many ounces? What animal is a carnivore and doesn't eat meat? What is th structure performing a specific function within a cell? What mineral is used in the production of steel and to give color? What kind of rock is elephanta caves made out of?