Occasionally, very occasionally, Heidi will show me something on youtube (or one of those Heidi-type sites) that is really very good. And this really is very good. The graphics are superb. The coverage of material is excellent. It is faithful to the evidence. It is engaging and it is narrated by an Australian. These are all, in my view, excellent things. This little video is a winner. Congratulations to Daniel Keogh, ABC science Show reporter and his excellent artistic person – Luke Harris.