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How It Works: Machines by Geek Kids 1.7 Next is Great 

Mobile \ Education

"Even very small children can take a look inside these transparent machines and see simplified (but accurate) depictions of how these parts come together to make a working machine." "Id love my children to get excited about engineering and design. This marvellously-crafted app deserves to. Free download of How It Works: Machines by Geek Kids 1.7, size 41.52 Mb.