I have a few questions, all relating to the title.
1) Is it possible to configure a server to receive the cookies using https but then serve all the content with http?
2) Does SE do this / do many sites do this?
3) Is it less costly on the CPU to only do the cookies over HTTPS?
4) Are there any security risks to doing it this way as opposed to all over HTTPS?
I'm not very experienced in this area, so my apologies if I've made some incorrect assumptions.