HorizonrevealshownewarchaeologicaldiscoveriesarepaintingadifferentpictureoftheveryfirstnativeBritons.Forcenturiesit'sbeenthoughtthatthesehunter-gathererslivedabrutal,hand-to-mouthexistence.Butextraordinarynewevidencehasforcedscientiststorethinkwhothesepeoplewere,wheretheycamefromandwhatimpacttheyhadonourearlyhistory. 　　Now,o...