It helps - no, really, it helps a lot - to understand and instrument before trying to use it. This is true of hammers and omelette pans - they're not wholly great substitutes for each other after all - and it's also trueTim Worstall is a wholesaler of rare earth metals and one of the global experts in the metal scandium. He is also a Fellow at the Adam Smith Inst in London and an writer for a number of media outlets, including The Times (London), Telegraph, The Register and even, very occasionally indeed, f ...