![Kohn–Sham approach to quantum electrodynamical density-functional theory: Exact time-dependent effective potentials in real space | PNAS Kohn–Sham approach to quantum electrodynamical density-functional theory: Exact time-dependent effective potentials in real space | PNAS](https://www.pnas.org/cms/asset/cf525a90-4d70-4384-847f-1291cf6aad39/pnas.2015.112.issue-50.largecover.png)
Kohn–Sham approach to quantum electrodynamical density-functional theory: Exact time-dependent effective potentials in real space | PNAS
![Santa's reindeer are real – and they live in the Northwest Territories | Spectacular Northwest Territories Santa's reindeer are real – and they live in the Northwest Territories | Spectacular Northwest Territories](https://spectacularnwt.com/sites/default/files/styles/hero_desktop/public/shutterstock_402837010_0.jpg?itok=Cz41mv0D)
Santa's reindeer are real – and they live in the Northwest Territories | Spectacular Northwest Territories
![Santa's reindeer are real – and they live in the Northwest Territories | Spectacular Northwest Territories Santa's reindeer are real – and they live in the Northwest Territories | Spectacular Northwest Territories](https://spectacularnwt.com/sites/default/files/styles/hero_desktop/public/shutterstock_111809156_2.jpg?itok=M7_C4MkK)
Santa's reindeer are real – and they live in the Northwest Territories | Spectacular Northwest Territories
![The True Story of Misty of Chincoteague, the Pony Who Stared Down a Devastating Nor'Easter | History| Smithsonian Magazine The True Story of Misty of Chincoteague, the Pony Who Stared Down a Devastating Nor'Easter | History| Smithsonian Magazine](https://th-thumbnailer.cdn-si-edu.com/BLfsUv7v9MTK6SqzQ0hWCqxuj4Y=/1000x750/filters:no_upscale()/https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer/9a/13/9a13ee09-ce25-45c2-8ce9-69962f7d75c2/ap_02072403180.jpg)