What may help officials find the rescued children’s parents?

Officials in China say they’ve rescued almost 90 children from trafficking rings operating across several provinces. More than 350 people suspected of involvement in the crime were arrested o-ver the past few days. Officials said they would now try to find the parents with the help of a national DNA database of genetic samples designed to help child trafficking.

The high-tech company Google has a fleet of self-driving cars. By August, they had logged 480,000 kilometers. Major auto manufacturers in the United States and Europe are also working on the technology for autonomous vehicles. Volvo is doing road tests and says it plans to sell driverless cars by 2020.