Environmentally-friendly fireworks have been developed to reduce the amount of atmospheric pollution produced. Traditional fireworks are normally made using a charcoal and sulphur fuel, a perchlorate oxidiser to help with burning, plus binders, colourants and propellants. When ignited, the pyrotechnics are spectacular, but they emit large amounts of smoke, unused perchlorates and metal by-products from the colourants, all of which are contaminates. Eco-friendly fireworks have a clean burning, nitrogen-based fuel. This means a perchlorate oxidiser is not needed and because there is little smoke, only small amounts of metal salts are needed to produce the brilliantly coloured flames.
Primary links
Diverse thinkers, from the ancient Greek philosophers through contemporary quantum cosmology and eternal inflation theory, have called time an illusion. For them, the perception of time passing...
Air crash investigators have found that flight stewards in rear-facing seats have suffered less severe injuries in accidents than forward-facing passengers. This is because the energy from the...
While Britons have pioneered all sorts of things from the steam engine and the computer to passenger jets and rugby football, we have dismally failed to maintain world dominance in much at all...
Most people agree that the years seem to pass at an ever-accelerating rate. That’s because traditions, anniversaries and celebrations gradually accumulate and merge, so that the difference...
Ordinary glass absorbs 97 per cent of the UVB rays that cause sunburn and some skin cancers, and 37 per cent of the less harmful UVA radiation. This translates to a protection of about SPF30, so...