The animal is a caribou in North America, and a reindeer in Europe. I don't know which term is proper in an island off Greenland, nor where the animal fur originally came from.
The winter solstice festival predates the Christian holiday. It's a cold climate thing, wanting to light up the long nights, bring nature into the home, eat high-calorie preserved food, etc. It's only natural to party when you can't work outside and the weather is depressing. Christians found it and used it for Jesus' birthday commemoration, so the holiday is both secular and sacred, depending on how you want to use it.
I always called my husband by his name, unless we were alone. Otherwise, how would I get his attention? Or how would anyone else know who I'm talking to? Maybe that's a function of having so many kids.
I always assumed that "fundamental" meant things that couldn't be further broken down. When I last studied physics (in elementary school) protons and neutrons were fundamental.
Personally, I will still buy the biggest turkey I can find, even with fewer family members. I love leftover turkey sandwiches! I strip the bird after dinner and freeze whatever I can't eat in the next few days, and leave enough time between getting packs out of the freezer so that I don't get tired of it.