More than half of the human body is made of water. We simply cannot live without it! Water carries oxygen and nutrients throughout our bodies, keeping us healthy and energetic. Water keeps our bodies at the right temperature, not too cold and not too hot. So, we need to drink lots of water every day to survive. However, only a small fraction of the water on the planet is safe to drink. In this episode of N'Gen, we look at every kind of water, from dirty puddles to saltwater, and find out how to test whether it is safe to drink or not. Get ready for some cool experiments you can do at home that show how to remove dirt, salt, and bacteria from water to make it pure and clean enough to drink. Water is the stuff of life, so make sure you know what you are drinking!

When we eat and digest food, it comes out of our bodies as poop, also known as human waste. This delicious food becomes brown and stinky when it is broken down by the bacteria in our bodies. All human communities need to remove this human waste far away from where they live and eat. This is because bacteria in human waste can cause serious diseases if we come into contact with it. Sanitation is the scientific word for how we dispose of our waste and keep our living areas clean. Human waste can also be useful for making fertilizer to help plants grow and for producing biogas to generate energy. In this way, sanitation can make human waste useful and not just a stinky substance to get rid of. After watching this episode of N'Gen, you will never look at poop in the same way again, and you will definitely remember to always wash your hands after using the toilet.