Ever been confused by all the letters and squiggles used by scientists? Hopefully these videos will unravel some of those mysteries.
Sixty Symbols is a collection of videos about physics and astronomy presented by experts from The University of Nottingham.
They aren't lessons or lectures - and they never tried to be an online reference book. The films are just fun chats with men and women who love their subject and know a lot about it!
It's worth noting many symbols have multiple uses across scientific disciplines and they sometimes tackle them from an unexpected viewpoint.
On gamma you'll find a professor of physics talking about cricket balls... and on rho stuffing paper clips into coffee cups.
And sometimes when there's no symbol to tell a story (like Schrödinger's cat), they just make one up! Whatever video you watch, they hope you'll see something interesting and maybe learn something new.
You may have noted more than sixty symbols in the playlist. That's because when they finished, everyone asked for more. They're currently working on the second sixty!
Watch the full documentary now (playlist - 13 hours)
In addition to explaining symbols, they occasionally post videos in response to viewer questions, including: String Theory, Galaxies, Speed of Light, LHC, Theory of Relativity, Changing Constants, Absolute Zero, Big Bang, etc.
Answers by experts from The University of Nottingham (playlist - 1 hour)