More than 70 schools in Australia and New Zealand were closed on Monday for cleaning after asbestos was discovered in widely used children’s play sand products.Recalls have been issued for several colourful play sand products after laboratory testing detected traces of tremolite and chrysotile asbestos.A number of schools and preschools in the Australian Capital Territory (ACT) and one in Brisbane shut on Friday after the Australian Competition and Consumer Commission (ACCC) issued a national...