Subscription boxes have become big business, with companies from Birch Box (beauty and grooming products) to Stitch Fix (clothing and accessories) to Blue Apron (meal plans) delivering a mind-boggling array of goods to front doors across the country. Subscription boxes for kids have been around for some time, too, and a few of them are great. We especially love the Kiwi Crate line, which delivers age-appropriate science, art, and engineering projects that get kids interested and teach them valuable problem-solving skills. Now Blue Moon Box hopes to appeal to young, would-be scientists, as well. Each box comes with two or three experiments for kids, often built around a theme — storms and weather, for example, or material science. One-, three-, six-, and 12-month subscriptions are available, priced from $25 to $210. And if your budding Mae Jemison or Michael Faraday wants to look the part, little lab coats and googles are also available. www.bluemoonbox.com.Hayley Kaufman can be reached at email@example.com.