In “A Year of War: Israelis and Palestinians,” Israelis describe what it was like to experience the deadliest day for Jews since World War II as the Oct. 7 attacks unfolded, with around 1,200 people killed and 251 taken hostage. And in Gaza, where more than 40,000 people have reportedly been killed in Israel’s retaliation against Hamas, Palestinians describe — and record — the horrors of large-scale devastation.