What are Christmas trees usually decorated with at the top?

A star or an angel

What charitable organization did Taylor Swift frequently contribute to, which focuses on children’s literacy? In ice hockey, what term describes a team's advantage when opposing players are serving penalty time? Baking soda and baking powder are examples of what group of ingredients used to raise batter or dough? Which bird is the largest existing species of bird? Who composed 'The Star-Spangled Banner,' the US national anthem?