The substance that reacts with the candle wax is oxygen. It comes from the air. Putting the jar over the candle keeps oxygen from outside the jar from getting in. The reaction can only ... there is a ...

Let me show you one of my favourite reactions. This fine powder is iron. When we sprinkle it over the flame, it lights up like a sparkler. The iron is reacting with the oxygen in the air to make a ...

Our immune systems rely on iron to function, but so do invading viruses and bacteria. New research from Binghamton University ...