We have all had to boil water as part of a recipe or to make coffee or tea, but did you know that boiling water is actually one of the most effective ways of making it sterile? Though it doesn't remove particles or contaminants, boiling is an effective way of killing microbes and disinfecting liquids so that it is safe to drink. For this reason, authorities always issue a warning urging residents to boil water used for consumption when there is a contamination in a town's water supply.
With this in mind, it may come as a shock that in some circumstances, boiling water can actually make it more hazardous. As this video is about to explain, reboiling can actually be detrimental to the purity of the water.