What the bloody hell is a "high-fidelity Inertial Harmonic Drive engine",
and what's it doing in a mouse?

Well, according to Immersion Corporation, who license out the technology
that Logitech have used in their "iFeel" mouses, it's making the mouse
"sixty million times better" than the regular kind.

I wasn't sure I could handle that much pleasure, but as it turned out, I
survived.

I also opened one of the mouses up, dismantled the Bussard ramscoop,
crawled through a Jeffries tube and found the Harmonic Drive engine. Ooh,
it's an exciting little thing.