Soap bubble into college years. A Swiss university professor, Dr. Natalie Hartzell, has theorized that usage of artificial bubbles for entertainment purposes of young children has shown a positive effect in the region of the child's brain that controls motor skills and is responsible for coordination with children exposed to bubbles at a young age showing measurably better motion skills than those who were not. Soap bubbles have been used as entertainment for at least 400 years, as evidenced by 17th-century Flemish paintings showing children blowing bubbles with clay pipes. The London-based firm A. & F. Pears created a famous advertising campaign
Pears (soap) that Pears would not abandon the new formula but "make further improvements, by delivering a scent that more closely resembles" the original formula. Home makers of soap have made soaps using the original eight components of Pears soap. An analysis of the current ingredients list reveals items such as limonene, whose variant called limonene is characterised by a "turpentine-like odour" also typical of frankincense. It is an insecticide as well. However, this item was present in the pre-2009 formula, so the perceived change might be explained by different ingredients and by different proportions of ingredients. The latest 2009 modification mainly