Turns out, some viruses didn’t just make us sick—they moved in for good. Scientists just found 2,500-year-old herpesvirus DNA literally fused into ancient human chromosomes. This viral hitchhiker, which still infects almost every kid today, has been quietly shaping our evolution, immunity, and even embryo development for millennia. Our genes are basically a living museum of ancient pandemics, and some of that viral DNA is now essential for life. Wild, right? #Science #ScienceFacts #AncientDNA