[https://arstechnica.com/information-technology/2021/08/now-that-machines-can-learn-can-they-unlearn/](https://arstechnica.com/information-technology/2021/08/now-that-machines-can-learn-can-they-unlearn/) >"Privacy concerns about AI systems are growing. So researchers are testing whether they can remove sensitive data without retraining the system from scratch."