When you share what you learn with your co-workers, that is leadership. That question is answered when we examine just what it is that leaders do. Leaders create values through communication. The things they communicate about relate to common values that are important to others. They enlist others in a noble cause that gives meaning and purpose to the work at hand.
Leaders also convey a vision of the future.
They become catalysts in defining mission and encouraging others to help in propagating that mission. Leaders encourage responsibility. They take steps to involve others and create a climate in which individuals feel responsible for what happens. By involving people, you empower them. Every time you bring a nursing issue into a conversation and stimulate thought, you are leading.