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Zor0 writes – “I just finished this little project (a LEGO South pointing chariot) very fun device. After I was done i did some googling and it turns out I wasn’t the first to try it, but its still an awesome idea. The south pointing chariot was first invented by Chinese Emperor Huang Di in 2634BC to be used by his armies, possibly the first use of a differential gear. If you are unfamiliar with differential gears, be sure to check out the Wikipedia Article. – [via] Link.