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One of the great ironies of science is that, in the search of truth, we spend all of our efforts trying to prove ourselves wrong. We design a model, assume it’s true, and test it against the data. When the data doesn’t fit, we toss it. And to be considered serious scientists, we need to try our hardest to prove ourselves wrong.

But what qualifies as “wrong?” Just how inconsistent does our data need to be before we toss the model? Part of the answer to this question comes from statistics, and a number called the P-value.

Welcome back! This is the last part of the series on relativity. Today we’ll talk about how gravity effects time and space. You might want to look at last week’s post before you read this one. It explains the basics of gravity in General Relativity. Go back to the Theory of Relativity for Kids if you want to start at the very beginning.

Welcome to part 3 of my series on the theory of relativity for kids. Start here if you missed the intro. Up until now, we’ve been talking about something called special relativity. Today, we’ll start talking about general relativity, a theory that explains the bizarre ways that gravity works.