22. What does it mean to 'enrich' uranium? Go back to the www. whatisnuclear.com page. At the top of the page, click on 'Reactor Tech' and 'Thorium as Nuclear Fuel: the good and the bad'. Thorium can be used to operate a nuclear power plant. It is referred to as fertile instead of fissile. 23. What does this mean? Scroll down to 'Molten Salt Reactors' Thorium could potentially be used in a molten salt reactor, one design of which is designated the Liquid Fluoride Thorium Reactor (LFIR). In this design, thorium is dissolved into a liquid salt. 24. Has there ever been a molten salt reactor in this country? When and where? 25. Is there any place in the world where one is currently being built? Where? At the top of the page, click on 'Concepts' and 'What is Nuclear Energy'. The last column on the table at the right side of the page under "Energy density of various fuel sources' shows how long a 100 Watt bulb could run from using 1kg of various fuels. Notice that 1kg of different fossil fuels will run the bulb for a matter of days while 1kg of nuclear fuels will run the bulb for hundreds and thousands of years. Look at the footnote at the bottom of the table. 26. How long would 1kg of weapons grade uranium power the entire US