Pick of the week: “Meru” (Amazon Prime) — My full review is here. And you think YOU’RE COLD. Blanket up and watch this thrilling documentary about three climbers who attempt to scale the 21,000-foot Himalayan peak nicknamed the “Shark’s Fin,” fall 100 feet short, and then overcome personal tragedies to try again. Co-directed by one of the climbers, Jimmy Chin, the film gives you a terrifyingly authentic sense of what it’s like to undertake one of these expeditions, as well as insight into what sorts of people would spend their lives doing so.