1) The word "pizza" contains two vowels: I and A.

2) The world's largest volcano, Mauna Loa in Hawaii, is also one of the most active.

3) The legislative branch in many democracies is responsible for making laws, representing the interests of the people, and providing checks and balances on the executive branch.

4) The development of artificial intelligence (AI) has led to advancements in areas such as machine learning, natural language processing, and computer vision.