Ken Jennings, tapped by some as the man most likely to take over for the late “Jeopardy!” host Alex Trebek, is doing some end-of-year apologizing. “Hey, I just wanted to own up to the fact that over the years on Twitter, I’ve definitely tweeted some unartful and insensitive things. Sometimes they worked as jokes in my head and I was dismayed to see how they read on screen,” the winningest “Jeopardy!” contestant ever tweeted Wednesday, kicking off a thread on the topic. A few of his questionable tweets: “Nothing sadder than a hot person in a wheelchair,” posted in 2014, was...