Toothbrush, Kindle, Nvidia: how much do you know about this week's gadget news?

Six quick questions on this week's hardware news: a new Kindle, Nvidia's leadership change, Apple smart home, Black Friday and two special research stories.

1. What is one of the main new features of Amazon's new Kindle Colorsoft e-reader?
2. According to the Financial Times, whom did Nvidia approach as a possible successor to the departed Jensen Huang?
3. Which two companies helped develop the first Apple Home Collection devices?
4. Why may the 2026 Black Friday offering be more expensive?
5. Where does the Chinese researchers' new toothbrush get its bacteria-killing electric charge?
6. What did Brown University researchers eliminate so magnetic materials keep working at atomic thinness?