![Cliff Pickover 在Twitter 上:"According to the Kurgan hypothesis, the Pontic Steppe (shown here) was the homeland of the speakers of the Proto-Indo-European language and the original domesticators of the horse. https://t.co/eo2ES2FkDd Cliff Pickover 在Twitter 上:"According to the Kurgan hypothesis, the Pontic Steppe (shown here) was the homeland of the speakers of the Proto-Indo-European language and the original domesticators of the horse. https://t.co/eo2ES2FkDd](https://pbs.twimg.com/media/D7Xcx6NW0AEg7vc.jpg)
Cliff Pickover 在Twitter 上:"According to the Kurgan hypothesis, the Pontic Steppe (shown here) was the homeland of the speakers of the Proto-Indo-European language and the original domesticators of the horse. https://t.co/eo2ES2FkDd
![The genetic and cultural barrier of the Pontic-Caspian steppe – forest- steppe ecotone | Indo-European.eu The genetic and cultural barrier of the Pontic-Caspian steppe – forest- steppe ecotone | Indo-European.eu](https://indo-european.eu/wp-content/uploads/2019/02/steppe-forest-steppe-europe.jpg)
The genetic and cultural barrier of the Pontic-Caspian steppe – forest- steppe ecotone | Indo-European.eu
![The genetic and cultural barrier of the Pontic-Caspian steppe – forest- steppe ecotone | Indo-European.eu The genetic and cultural barrier of the Pontic-Caspian steppe – forest- steppe ecotone | Indo-European.eu](https://indo-european.eu/wp-content/uploads/2019/02/steppe-forest-steppe-biomes-1.jpg)