ELI5 Legos - how do lego bricks not lose tension after years of repetitive play?

ELI5 Explain Like I'm 5: Bite sized answers to stuff you should know about - in a mini podcast

What is Lego’s company motto? What does the word Lego mean? How do lego bricks not lose tension after years of repetitive play? If Lego had a patent on their interlocking bricks, why are there so many copycat versions? How many lego pieces are in circulation? What’s the biggest lego set?

... we explain like I'm five

Thank you to the r/explainlikeimfive community and in particular the following users whose questions and comments formed the basis of this discussion: madeleinedean, 080087, option8, squeevey, laeiryn and gragert.

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