Imagine you're a researcher studying how sleep affects mood. To explore the connection, you would look at two key "variables": sleep (how much someone gets) and mood (how happy or irritable they feel) ...

Scientists often want to find out if changing one variable makes a difference to other variables. In many (though not all) investigations the variables are kept constant - the control variables, apart ...

What Is the Scientific Method? The scientific method is a systematic way of conducting experiments or studies so that you can explore the things you observe in the world and answer questions about ...