And let's say that the variance, let's say the standard deviation of Y is also equal to two hours. And let's say that the variance of Y, variance of Y, well, it would be the square of the standard deviation, so it would be four hours, four hours squared would be our units. So if we just tried to blindly say, oh, I'm just gonna apply this little expression, this claim we had, without thinking about the independence, we would try to say, well, then the variance of X plus Y, the variance of X plus Y, must be equal to the sum of their variances. So it would be four plus four. So is it equal to eight hours squared? Well, that doesn't make any sense, because we know that a random variable that is equal to X plus Y, that this is always going to be 24 hours. In fact, it's not going to have any variation.