Wait 20,000 years and they’ll swap positions. https://phys.org/news/2019-01-sahara-swung-lush-conditions-years.html https://phys.org/news/2019-01-sahara-swung-

Wait 20,000 years and they’ll swap positions. https://phys.org/news/2019-01-sahara-swung-lush-conditions-years.html https://phys.org/news/2019-01-sahara-swung-lush-conditions-y...