A practical challenge that Citizen Maths has is that we make quite a lot of use of Scratch as an environment in which learners can try out some of the maths. Currently Scratch needs Flash, though work is going on in the Scratch community to develop an HTML5 player (for more on this see <a href="http:&#x2F;&#x2F;wiki.scratch.mit.edu&#x2F;wiki&#x2F;HTML5_Player" rel="nofollow">http:&#x2F;&#x2F;wiki.scratch.mit.edu&#x2F;wiki&#x2F;HTML5_Player</a>). For some background on the use of Scratch in Citizen Maths see <a href="https:&#x2F;&#x2F;www.citizenmaths.com&#x2F;how-to-use-scratch-in-citizen-maths&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.citizenmaths.com&#x2F;how-to-use-scratch-in-citizen-m...</a> and <a href="https:&#x2F;&#x2F;www.citizenmaths.com&#x2F;using-scratch-in-citizen-maths&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.citizenmaths.com&#x2F;using-scratch-in-citizen-maths&#x2F;</a>. I guess it is fair to say that we are more tolerant of Flash in some other parts of Citizen Maths than we otherwise would be. For the time being at least. (PS - hello Keith! It&#x27;s a small world.)