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A comment on Military technology: Magic bullets. Parent comment

Re:Military technology: Magic bullets by mhb on Sunday January 15, 2012 @11:08AM (#3467413)
Ten years ago, I had a $2 top with LED lights which cleverly displayed words in a fixed position by using a sensor to use the earth's magnetic field as a reference.
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Re:Military technology: Magic bullets by joezydeco on Sunday January 15, 2012 @07:28PM (#3468794)
If the top cost $2, it probably was not a magnetometer clocking the LEDs in that toy.
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