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The interface used for Cell Size and Scale [genetics.utah.edu] travels through the space from 1 meter to 1 trillionth of a meter in single, continuous scrollbar swipe, revealing the relative size of a grain of rice to that of a rhinovirus or a water molecule.

The whole website is full of interactive infographics, similar to John Kyrk's examples.

See also:
- Nano Journeys
- Nikon Universal Scale
- Powers of Ten Movie
- All the Water in the World
- Sizeasy
- Relative Planet Size

Via @congosto.