A recent study into synthetic hair, which many black women use to achieve popular hair styles including braids, found that ten samples of the most well-used brands contained carcinogens, and in some cases, lead. It's provoked a big reaction online. Nuala McGovern is joined by academic and author of Don't Touch My Hair, Emma Dabiri, and also by BBC Correspondent Chelsea Coates.New play Shanghai Dolls explores the relationship between two of the most influential women in Chinese history during the cultural revolution; Jiang Qing (also known as Madame Mao – one of the architects of the Cultural Revolution) and Sun Weishi, China’s first female director. Amy Ng the playwright and Gabby Wong, who plays Madame Mao, join Nuala in the Woman’s Hour studio.Set in a quiet 1950s seaside town in a boarding house full of strange characters, Jess Kidd’s new novel, Murder at Gull’s Nest, is the first in a new series of books. Jess talks to Nuala about the heroine of the series, the fearless former nun Nora Breen, who has left behind her enclosed order of nuns after 30 years to solve crimes.Presenter: Nuala McGovern Producer: Laura Northedge