You were right to use that computer as an example. Here's an MRI probe that's quite literally microscopic. Fig 1 says it's about 3.5µm in diameter. [1] [1] ht

You were right to use that computer as an example. Here's an MRI probe that's quite literally microscopic. Fig 1 says it's about 3.5µm in diameter. [1] [1] http://arxiv.org/pdf/1603.04238v2.pdf http://arxiv.org/pdf/1603.04238v2.pdf