Some of the earliest solid evidence of poison use is traces of the highly toxic compound ricin on 24,000-year-old wooden applicators, found in South Africa's Border cave. However, archaeologists have long suspected this hunting technique is much older, and new evidence now suggests humans have been shooting poison arrows through the last 72,000 years. In a new study, archaeologist Marlize Lombard from the University of Johannesburg in South Africa examined the unique properties of known poison arrows, comparing them to those that don't rely on poison, by analysing 128 bone pointed arrows. Arrows that don't use poison need to deeply pierce the...