ABC’s "World News Tonight" anchor, David Muir, is here – and he's sharing feel-good stories and a sweet letter from his littlest fan. Plus, YouTube star Donal Skehan has two easy recipes your family will love: One-Pot Cauliflower Mac and Cheese and a Speedy Chicken Pot Pie. Then, "Tell Me a Story" star James Wolk gives Rach the scoop on his new show. (See the billboard that *freaked* Rach out.) And Rachael has a statement salad you’ll be psyched about!