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@mmedevries: @Visschinspired #mathphoto17 #estimation How much does this rock weigh? How did it get here? 12yo and 10yo for sca… https://t.co/unj5g1u2ia | by tads2

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@mmedevries: @Visschinspired #mathphoto17 #estimation How much does this rock weigh? How did it get here? 12yo and 10yo for sca… https://t.co/unj5g1u2ia

@Visschinspired #mathphoto17 #estimation How much does this rock weigh? How did it get here? 12yo and 10yo for sca… t.co/unj5g1u2ia - @mmedevries

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Uploaded on July 12, 2017