i saw on the DW-TV channel that a German physicist called Peter Andreas Grünberg discovered the phenomenon of "giant magnetoresistance", in which weak magnetic changes give rise to big differences in electrical resistance.
And a computer hard-disk reader that uses a GMR sensor is equivalent to a jet flying at a speed of 30,000 kmph, at a height of just one metre above the ground, and yet being able to see and catalogue every single blade of grass it passes over.
This is IBM's product.
Hitachi has one too.
http://www.efluxmedia.com/news_Hitachi_Announces_4TB_Disk_Drives_through_New_Head_Technology_09610.html
Others will follow I'm sure.
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