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(More customer reviews)My 9 year-old son who's really into gems and minerals received this for Christmas. Great gift! There's instant gratification with the "crystal mine," one of those dig it type activities, and fun watching different colored "gems" (simple crystal formations) grow on a rock which you supply. This takes about a week. My son has a collection of these crystal formations displayed in his room. With adult help and supervision, a child as young as 6 or 7 could have fun with this kit. One caution, though. My younger son accidentally spilled the green growing solution which contains a huge amount of coloring. Though we were able to clean it up, it was a big mess on the granite counter, wall, and tile floor. Next time we chose a container with a lid. Overall, a very cool gift, and different than anything I was able to find locally.
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Expedition : Skull Of Tyrannosaurus RexTyrannosaurus Rex was one of the most fearsome dinosaurs that ever walked the Earth - reaching a length of 47 ft (14 m) and a weight of up to 8 tons. With its 5 ft (1.5 m) head it could have swallowed humans whole if they had evolved by then! This kit allows you to excavate, restore and display a 7" (18 cm) reproduction of such a giant skull, embedded in a slate-like slab of rock. WARNING: Ages 7 +. Not Suitable for children under 3 years of ages. Contains small parts which may be ingested. Conform to ASTM F963-07

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