The rod photoreceptors of the eye are somewhere between - but where?
From the University of Utah comes a slick visualization of scale ranging from coffee beans to carbons atoms. And yes it includes a rod photoreceptors part of the way through.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhh27XMGHVdpRyWO7mjv2T_IdMCZynnDjO5FWlMxXzhKvv7YVwSHWSP6kiqvxvPrB5bmZMNdrRLTph5qFBOakrpLf1gCvEvlfPovMTydsaZZ8Dr5Dzud1GD1zG7_CF0vPUGKhe8alnZPpM/s800/rod.jpg)
A nice educational demo listing metric units and lots of other labeled examples. Thanks to Tim for the forward.
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