This all started when my youngest Grandson asked how long is it until Christmas?I started thinking of some way for a three year old to understand what how long means? Like the relationship between Days, Hours, Minutes and Seconds. He knew what "Today" was as well as Tomorrow,, but beyond that,,, Kno...By: Giant RC Guy
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from Instructables: exploring - technology - robots http://ift.tt/120M5iu
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