I know it's wrong but I have to get it out of my head. I generally think it's a bad thing to know the first letter. Leads to all kinds of weird guesses.

I was sure Software was right until I noticed the answer to the "proof" question.

[Rosie] Surface areas? NO
[Software] Maths expression? NO
[Projoy] Angle measurer? NO
[CdM] Clue in the name? YES *audience applause*
[Projoy2] Proving the square? YES *more applause*

[Rosie] Correct, it was indeed a Pythagorean Triple!
My confusion with some of the earlier questions arose when trying to work out whether mathematics could be classed as a science or not. But by reaching the correct answer I can rest easy knowing that if any of my answers were wrong, they weren't so wrong as to block out the answer completely.

One triangular baton handed over to Rosie.

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(I can't resist pointing out that although I had never previously heard of "a Pythagorean triple", I still came quite close to winning that round! Good clues.)

(Projoy, Chalky) Yes, I'd agree it doesn't quite trip off the tongue in the same way that Pythagorean Triangle does though it is a quite genuine mathematical term. BTW, did you know that 3 cubed plus 4 cubed plus 5 cubed equals 6 cubed?

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OK, this is ANIMAL

(Projoy) Human? - YES.

I'll go away now.

(Dujon) Mr Steam Engine? - alas, NO.
(GL) Alive? - YES. Still alive? - A separate question

(Softers) Entertainment? - NO, and for some, not in any way whatsoever.
(Projoy) Fictional? - NO. You may have been misled by my supplementary to Gusset Login in which I had taken his question to be "Alive and very old?" This person exists.