[orphea]

You can also tie two knots but in the opposite directions:

https://youtu.be/8DBhTXM_Br4?t=1711 (Veritasium)

[burnt-resistor]

Veritasium is owned by private equity.

[orphea]

It is, but luckily, private equities don't decide whether knots untie or not, so the video may still be helpful.