Our thumbs allow us to use a variety of tools, from hammers to smartphones, and a new analysis of hominin fossils suggests they have a long history
Source:
https://www.newscientist.com/article/2266033-our-dexterous-thumbs-have-a-2-million-year-old-origin/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home