I used to creep down stairs in the early hours of the morning in the 1980's to watch Open University. Happy days!

I used to watch them every weekend as a kid, because I got up early and there was no kid's TV on until later back then. If you wanted to watch TV early, only this was ever on lol.

We need more intellectually stimulating television programmes like this, and less X Factor.

this is fantastic! i love this timeless instructional programs

I actually remember watching this - it would have been one of its last TV showings in the mid 2000s (maybe this showing?) when I was a sleep-deprived teenager. Didn't quite get all of it but interesting to watch!

21:31 Oh, Jeremy!

Beautifully told. Thus just triggers my curiosity.

i love when he's making a particularly noteworthy point and his voice cracks.

I miss open university programs on tv on in the early morning

Anyone else procrastinating math homework to watch this?

mind blown at 12:21

Brilliant videography! The shirt that changed.. The camera dollies and the 3D models. Wow.

Jeremy Gray is still at the OU :)

Left school with no exams ,didn't like the style of teaching , used to watch these to see what I was missing got married and worked all hours god sent bang went watching them . Much later on I was recovering from severe ear infection and surgery read a book forget title in which it claimed that time is relative and gravity is a fictitious force. This was contrary to what I learned in school,I liked science there, got into special relativity and tried to understand general relativity still trying geometry on a sphere is the key but alas the mathematics is still beyond me. Learnt a lot about Einstein the man though .

0:15 either Jethro Tull or Mick Fleetwood teaching math.

Fantastic video. Helped me get the basics

Thank you for the upload! :)

The 5th postulate *is* intuitively obvious.

Thanks for uploading ... Do you have anymore videos in the series?

i think euclid refered only to a straignt line in his parallel postulate. . a line drawn on a globe is not straight so the postulate do not apply.

It seems that men wore non-Euclidean clothes in the 1970's....

Ah yes, curved space. *straightens monocle*

That parallel postulate looks obvious to me.

Well, that was clear enough. Lolol.

Oh man, I remember watching this when it was on! Up way too late.

That gives me the fuckin' nostalgia horn

This is dumb. Euclid's postulates are valid IN Euclidean space. Gee, why doesn't diesel work in a gasoline engine?

"The Sum of the Angles" by Concretism brought me here.

Creepy good..

How I can get the script of this lecture or video?

Be honest how many of us had heard of this topic before now?

I watched this as part of my degree course!

we live in a non euclidean space

looks like a non eucledian beard :D

Good old bbc

blew my mind

i'm procrastinating going to bed ;)

Geometry hmm interesting.

This guy must have got some serious poontang