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It seems like common [sense / sensible] to most parents to make sure their baby is always in a [clean / cleanse] place. Most parents do their best to keep dirt and bacteria away [from / of] their little ones. However, a scientist says dirt is an important [party / part] of making babies [strength / stronger] . Dr Jack Gilbert from the University of Chicago studies the ecosystems of bacteria. He did research into how dirt and bacteria [effect / affect] children. He published his research in a book [called / calls] 'Dirt is Good: The Advantage of Germs for Your Child’s Developing Immune System'. He told America's NPR news station [what / that] : "It's fine to wash their hands if there's a…flu virus [going / gone] around, but if they're interacting with a dog and the dog licks [their / there] face, that's not a bad thing."

Dr Gilbert wrote that [lets / letting] children get dirty was [largely / large] beneficial. Exposing small kids to dirt helps them [to / by] build their immune system. Dr Gilbert even argues that children often get [allergy / allergies] because parents try to protect their kids [too / to] much and try too hard to clean everything that children use. He said parents [know / now] over-sterilize everything in the home. This causes children's immune systems to become too [sensitivity / sensitive] , which can lead to things like asthma, eczema, and food [allergies / allergic] . Gilbert even defended the "five-second rule". Many people think it is OK to eat something that [fall / fell] on the floor for fewer than five seconds. Gilbert says it is OK to eat something that fell on the floor as long as the floor isn't [real / really] dirty.