I am a maths teacher and wish to explain the knot theory to my students with the activities for the coming math fair in my school. What will be your advice, thank you very much in advance.

Ersin Ilhan
Mathematics Teacher
Turkey

Dear Ersin:

The topic of knots while offering attractive hands-on experiences has a non-trivial mathematical framework. There are four excellent and very accessible books touching on knots:

1. M. Gardner, Knotted Doughnuts, W. H. Freeman and Co, 1986
   
2. I. Stewart, From Here To Infinity, Oxford University Press, 1996
   
3. V.V. Prasolov, Intuitive Topology, AMS, 1991
   
4. C. Livingston, Knot Theory, MAA, 1993
   

The first two are absolutely popular, the fourth is the most "mathematical" of the four.

There's a nice introductory site:

https://www.c3.lanl.gov/mega-math/workbk/knot/knot.html

You can also mention the related Braid Theory: