Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to [email protected].
Is the science that we do today truth, likely to be a lie, or is it undetermined? – Nathaniel K., age 15, Hamilton, Ohio
For most students, science is something you study and something you have to learn. I remember when I was in school, adults were always asking me things like “Do you like math?” and “Do you like science?” It’s almost like asking someone if they like spinach or broccoli.
In reality, science is not really a specific thing to like or hate, or something to believe in or not. Science is an activity. As one famous scientist put it, “Science is what scientists do.” It’s a way of working, a way to get things done.
So, then, what is it that scientists do? As a historian of science and medicine, I’ve studied how scientists try to understand the rules that govern things in the universe. For example, what makes the Moon orbit the Earth? How do clouds produce rain? How do people catch a cold? To answer questions like these, they do three things: They observe, they experiment and they analyze.
The process of science
All scientists carefully observe the subjects they are studying. Take the case of Charles Darwin and his theory of evolution by natural selection. Darwin traveled the world collecting specimens of plants, animals and fossils to figure out how they came by their different features.
He soon came up with an idea: Maybe certain species in an area look the way they do because they have characteristics that are best adapted to the environment they live in, and they are passing these on to their offspring. Darwin kept testing out this idea everywhere he went, and in the end his theory seemed to work. Ever since, scientists have conducted countless studies that affirm his theory.
Many scientists take observation a step further by performing experiments. In an experiment, the scientist might use a laboratory and special instruments to modify something they’re studying and look at the effects of the change. Their aim is either to test a theory or to see whether certain changes occur regularly.
A good example of this process can be seen in the experiments conducted by Ivan Pavlov in the 1890s with dogs. By introducing a sound right before a dog would be fed, Pavlov found the dog would start reacting to the sound the very same way it reacted to a bowl of food. For Pavlov, this demonstrated that animals learned through a process of association, or “conditioning.”
