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Right mouse click, select AdSense preview tool.
The AdSense preview tool shows normal ads about electric vehicles and parts for electric vehicles.
But Yahoo shows only ads for the secret how to drive a car by water.
I stopped linking to a site full of such 'over-unity' (perpetual-motion machine) nonsense ads when the site owner didn't seem concerned. AdSense/AdWords ads too.
I think at some point G should clamp down on out-and-out scams like this, that part the well-meaning but non-technical from their cash.