On Monday, China released a new report alleging that the US National Security Agency had not only carried out attacks on Northwestern Polytechnical University in Xi'an, Shaanxi province, but also hacked key infrastructure to acquire user data.

In 2013, US media reported that the Office of Tailored Access Operations under the NSA had been hacking China for over 15 years. Why does the NSA want to hack into NPU? How can ordinarily citizens better protect their personal data? Check out this episode of science talk to find out.