Wisdom  
Bret Victor
Apple Human Interface Inventor

Computers
Knowledge
Back in the days of Roman numerals, basic multiplication was considered this incredibly technical concept that only official mathematicians could handle. But once Arabic numerals came around, you could actually do arithmetic on paper, and we found that 7 year olds can understand multiplication. It's not that multiplication itself was difficult. It was just that the representation of numbers—the interface—was wrong.
   
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