It can also change.

I was right-eye dominant, but developed a cataract in my right eye and even after getting an IOL I am left-eye dominant now.

another version is make a triangle with your fingers. With both eyes open, line up on a distant object.

Without moving, close one eye and then the other.

Your dominant eye will still have the object centered. Your subordinate eye will cause the "window" of your fingers to move.

Quality definitely varies by author, and outside the 60 Hours Heresy series there are some great other series like Eisenhorn and Gaunts Ghosts. And even humor like Caiphas Cain series.

On the use of old historical texts (esp Catholic) one my favorites is the Sabbatine Martyr connection from Gaunts Ghosts. Sabbatine in 40k is a Joan of Arc type character that dies a martyr (not a spoiler, ancient backstory in the books). A system is named after her, which sets up the title of one of the books “Sabbat Martyr” a play on the prayer/hymn “Stabat Mater”or “Sorrowing Mother”

Video games were the devil, so no. :(

I bought a couple boxes as a kid from oriental trading company.

Edit : they still have the big ones. https://www.orientaltrading.com/large-war-plane-gliders-12-pc--a2-5_1572.fltr?keyword=Plane The ones I got before were 48 packs