Wonder if what bacteria lingers around your house: on piano keys, telephones, computer keyboards? In this kit, your kids can grow bacteria they find. To learn about weight and volume, they can make a scale. They’ll test PH levels to learn about acids and bases. As with all young scientist kits, my young kids look forward to the experiments, and I look forward to having the supplies in the box. Common household items, needed but included, are clearly identified.