1. Explain the most interesting science concepts you learned during this investigation. The most interesting science concept we learned was that boiling one of our methods turned out to be the worst for us, but is the best solution out of the three for purifying water. This is scientifically proven because when it is boiling, the liquid changes its state of matter, leaving behind the bacteria and the water evaporating, leaving all the unnecessary weight needed, also because most of heat kills bacteria. In contrast, ultraviolet light only kills microbes, nothing else. Ultraviolet light is not very effective because it leaves the remains of bacteria in the water.2. Explain the scientific techniques and skills you used to conduct your investigation. The scientific techniques that were mainly used in conducting our investigation were identifying bacteria using a microscope, putting together a simple distillation kit, treating petri dishes with agar. top with boiled, distilled or irradiated water and calculating the bacterial coverage on the treated surface area on the Petri dish. All of these scientific techniques played a crucial role in our investigation. Without all these techniques, we would not have been able to conduct such a successful experiment. Identifying bacteria under a microscope was not easy since it was the first time we identified bacteria. After one of our trials, we poured a drop of water onto a slide, then added sodium iodine, because iodine helps the bacteria show more. We would then observe the water and record our qualitative observations, half of which came from observing under a microscope and the other half from observing the water... middle of paper ...... millions of people every year, so that's 6,000 children every day. Waterborne children are particularly vulnerable to waterborne diseases. Their small bodies absorb a disproportionate amount of water and its contaminants, and their immune systems are not equipped to fight bacteria such as E. Coli, Giardia, and typhoid bacteria. More than 2 million children are killed each year by these diarrheal diseases, and 90 percent of them are children under five years old. Global warming is also exacerbating this crisis, as severe and prolonged droughts dry up water supplies in arid regions and heavy rains from sewage overflows. In terms of the number of people affected, lack of access to clean water and basic sanitation is a major problem. However, it is a problem that calls for various solutions. People who get sick from illnesses transmitted through their bodies cannot function very well.