Plastic is in our clothes, cars, mobile phones, water bottles and food containers. But recent research adds to growing concerns about the impact of tiny plastic fragments on our health. A study from the United States has, for the first time, found microplastics in human brains. The study, which has yet to be independently verified by other scientists, has been described in the media as scary, shocking and alarming. But what exactly are microplastics? What do they mean for our health? Should we be concerned? What are microplastics? Can you see them?We often consider plastic items to be indestru…