Dr Karl

Calcium atoms are replaced every seven days or weeks or years.

And three, well, there's three days of the week according to the country and Western singers, yesterday, today and tomorrow, and each one worse than the one before it.

So you put them together, you get 21.

And it turns out that the average time to build up a habit and make it automatic is 66 days, but it varies from 21 to 280 days depending on the person.

Really?

And you've just got to do it and make it automatic and have low friction.

So with regard to going to the gym, I suddenly realised there's this whole thing where for most people you have to get your clothes on and then get a gym membership and then shift your body to the gym.

And I was thinking of the Pilates yoga type style where you just use your own body weight and a mat and that's got very low friction.

You can just say, I'll do it now.

And so there we are.

We're giving moral messages of advice.

With a...

No.

Come on.

No.

Some creatures can put to sleep half their brain and dolphins can do that.

And one part of their brain goes totally to sleep and they swim in the middle of the pack in such a way that they're looking at other dolphins swimming in that pack or pod, not looking at the outside world because otherwise they could drift off.

So the half that's awake is just following what the other dolphins do.

Pelicans can do it to a minor degree, but they don't go into a total sleep and they do that hemispheric one side of the brain or the other.

There are some birds that do a lot of gliding.