When I was a kid, I remember a dentist coming to school almost every year to tell us how to properly take care of our teeth. While they handed out plenty of advice — such as making sure to floss and avoiding too much sugar — the biggest takeaway was a rule of thumb that most of us are probably familiar with: brush your teeth two times a day and for two minutes each time.

This guidance has been around in some iteration since the 1970s. Studies in the 1990s showed it really was a good tactic for removing plaque. But more recent research suggests brushing for three or four minutes might actually be significantly better. However, time isn’t the only factor, and there’s also the risk of over-brushing to consider, as Josefine Hirschfeld explains.

The novel Dune, recently adapted into a movie, is set on the desert planet of Arrakis. But can a barren world first envisioned in the 1960s stack up against the latest mathematical models of a climate system? Three climate scientists, and sci-fans, have tried to find out by simulating what such a planet would actually be like to live on.

In advance of today’s budget, a finance and economy specialist has answered some big questions about what to expect from Rishi Sunak’s announcement. Plus look out for our expert reaction once the tax and spending plans have been delivered.

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