No matter how much you wish it werenâ€™t so\, gas makes kids giggle. A lot. With the Fart Experiment kit from NPW\ children can find the science hidden inside the silly. When the non-toxic compound included is mixed with water\ a clammy\ gooey putty is made. Push the goo back into the pot and listen as the expelled air makes\ well\ a whoopee!"Recommended for children ages 8 and older.