Occam's Razor, which says, given a choice, the simplest solution is best. This why I've titled all my books SIMPLE SOLUTIONS.
Operation Plowshare, where we suggested the use of conventional explosives to spur in-situ coal and oil shale gasification. It has taken nearly a third of century for this early research to lead to fracking and natural gas. Plowshare, of course, used nuclear weapons and spent nearly a billion dollars until 1977 when it was terminated. No one talks about it today, but one fantasy thought was to explode hydrogen bombs underground and capture the energy in place.
There are two major types of fusion: inertial (laser) and magnetic (donut) confinement. There is a hodgepodge of others, such as cold fusion, and a variation of the former in heavy ion fusion. I will report on all four technologies in subsequent articles.
General Secretary Mikhail Gorbachev, proposed to President Ronald Reagan an international project to develop fusion energy for peaceful purposes. This was the beginning of the International Thermonuclear Experimental Reactor, now only known as ITER, and selected the Tokamak. The U.S. remains a partner, but now seems more interested in our laser focused National Ignition Facility at LLNL.