Certain ancient stone tools were heated to over 200 °C to make them easier to shape – suggesting their makers had control over fire
Source:
https://www.newscientist.com/article/2256199-ancient-humans-harnessed-fire-to-make-stone-tools-300000-years-ago/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home