Students practice skills in order to become good at them. Doing something once is not enough. Think of something new you learned and how much practice it took to be really good at it. It's the same for learning science. And it's the same whether you are young or old.
Students learn to think for themselves and recognize false claims.
When we watch television, advertisers try to talk us into buying their products. They tell us that their products will make our lives better. To decide this for ourselves, we need to get in the habit of asking for evidence or proof. Asking for evidence is a scientific way of knowing that also helps in our everyday life. Students work in groups.