Lowest published toxic concentration

Okay kiddo, let me explain what a lowest published toxic concentration means. You know how there are things like medicines and chemicals that can be harmful to us if we are exposed to them? Well, scientists need to figure out how much of that substance is safe for us to be around.

The lowest published toxic concentration is the smallest amount of that substance that has been tested and found to be harmful to living things, like people or animals. So, if scientists expose some mice to a chemical and find that the mice start getting sick when they are exposed to a certain amount of the chemical, that amount is the lowest published toxic concentration.

It's important for us to know what the lowest published toxic concentration is because it helps us avoid being exposed to harmful substances. For example, if we know that a certain chemical is harmful at a concentration of 1 part per million, we can make sure that we don't use too much of that chemical in our products or that we don't drink water that contains too much of it.

So, just like how you have to be careful with your toys and not put small things in your mouth because they might be harmful, scientists need to be careful with chemicals and figure out the lowest published toxic concentration so that we can all be safe!