(I'm totally not an expert here) There's a ton of archaeological research into human-made stone tools, worldwide. There's very high degree of confidence at thi

(I'm totally not an expert here) There's a ton of archaeological research into human-made stone tools, worldwide. There's very high degree of confidence at this point into which artifacts can only really be human-made, versus made by other animals or natural processes. My guess is organic evidence of human activity would be really unlikely to survive in the South Asian rainforests, so I'm guessing this one of our better sources of information on human activity there. If you're asking how do we know this refers to Homo Sapiens, versus other species in the genus Homo, I'm guessing we can't really tell that.