Well before 1945 the most sought-after steel in physics was produced, much of it from old warships and shipwrecks. Not as strong or lasting as modern steel. What makes it valuable is something it never had. The first nuclear tests changed the atmosphere. Artificial radionuclides were released into the atmosphere and spread around the world; steel produced subsequently can contain low concentrations of these nuclides. For ordinary purposes, the difference is meaningless. Illus

As the world grapples with the existential crisis of climate change, discussions around sustainable development have become the global...

Biofuels are plant and animal waste-derived oil/substances which are renewable in nature and used as a source of energy. These are not...