Steel was in short supply during the height of World War II, and there was nothing to be done but invent a replacement. One proposal was called Pykrete, a mixture of ice and sawdust that melted ...

Winston Churchill had a project to produce a 2.2 million ton pykrete (ice and wood pulp) aircraft carrier that would have been 1200 meters long and 180 meters wide. This would have made it 3.5 times ...