Yesterday is history, tomorrow is a mystery, today is a gift of God, which is why we call it the present.

Once refugees reach the crowded camp, they must set up their own tents with bamboo sticks and a tarp," says photographer William Daniels. "In every tent I entered someone was wounded or sick, or traumatized by having witnessed family members killed before their eyes. All of the children of Nur Kober ery year, we look at the photos that moved us most. The funny, frustrating, and poignant images that we linger on a little more than we did on other photos because of how they make us feel. The famed photographer Ansel Adams called this feeling the measure of photographic excellence when he said, "A great photograph is a full expression of what one feels about what is being photographed in the deepest sense."![]This year, from the almost two million images National Geographic received from photographers all over the world, we chose our favorite 30. Favorite, of course, is subjective. How you feel about a photo depends on your mood, the time of day when you see it, a childhood memory it might evoke. Selecting photographs is notoriously difficult. Narrowing down emotionally-powerful images is even harder—a little like picking among favorite family members.