1. 4. We were wrong - the testes are connected to the immune system after all. Researchers have discovered a "very small door" that allows the testes to send one-way signals to the immune system, and it could explain why some men struggle with infertility, and why certain cancer vaccines keep failing.
2. Stand: Coca-Cola CEO Muhtar Kent called for immigration reform
3. A BuzzFeed News analysis has identified the 50 fake news stories that attracted the most engagement on Facebook this year. Together they totaled 21.5 million likes, comments, and shares. Of these stories, 23 were about US politics, two were about women using their vaginas as murder weapons, and one was about a clown doll that actually was a person the whole time.