I don't ordinarily post or link to YouTube videos anywhere: not here, in email, or on Facebook. Yet this is the second one I've posted to the blog today. And (horrors) I don't always Rick Mercer's humour.
But this video is hilarious and worth the minute and a half it takes to watch it. It very clearly explains why, beginning in late February or early March, Environment Canada always says the temperature will rise above freezing to +1C on the 7th day of the seven-day forecast [via RedHen and MsEclectic].
I love the line that "Pretty much everything beyond five days is like throwing darts." That line reveals a clear, intuitive understanding of confidence intervals. See this, for example (including the comments!):