[4 ESO] Making sense of irrational numbers

Here you can watch the Ted-Ed video "Making sense of irrational numbers" by Ganesh Pai and animated by Anton Trofimov:

You may activate the subtitles (avaliable in English, Spanish and many other languages) or you may check the transcription here.

The following video talks about the infinite amount of natural numbers using the Hilbert's famous hotel paradox. We will talk about this in Unit 1:

If we notch up the level of abstraction a little bit you can watch this video that talks about Cantor ideas about infinity and how there are infinities of different sizes: