This is how the third-graders at Indian Mounds Elementary School in Bloomington started their first day of computer science lessons. “Legos are a great way to think about computer science, and you can get really creative with them,” said computer science teacher Lee Nelson. “It’s a great way to get the creative juices flowing.”Indian Mounds, part of Bloomington Public Schools, is a computer science immersion school, meaning K-5 students not only take dedicated computer science classes every week, but are encouraged to incorporate computer science lessons and skills into other subjects, too. A second Bloomington school, Poplar Bridge Elementary, also has a computer science immersion program. Jack Ell, third-grader at Indian Mounds, is “mad about computer science,” said his mother Angie Hendrickson.