[renjimen]

The Tazmanians are a perfect example of this. They were separated from mainland Australia around 10,000 years ago by rising sea level. In that time they regressed technologically to the point where they had only 24 distinct tools compared with the several hundred available to the mainlanders.

[dilyevsky]

Reminds of this awesome talk about technology collapse, has some petty cool historical examples too - https://m.youtube.com/watch?v=ZSRHeXYDLko