Jelle Bakker, who has a fondness for complex marble runs, made this epic 750-feet long sand track that descends some 125 feet from its start to its finish. The 12 marbles competing in this video take ...
Marblelous’ building kits feature Wi-Fi-connected Smart-Tricks that can activate your smart home. Marblelous’ building kits feature Wi-Fi-connected Smart-Tricks that can activate your smart home. is a ...
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