Scientists have long collaborated across borders. The scientific values of transparency, rationality, and universality are the same all over the world. Scientists are typically altruistic, open-minded, and passionate people who believe science serves humanity. They are natural consensus builders, driven by evidence, and generally respected in most countries and societies. Since these characteristics are very valuable in the conduct of international relations, science diplomacy may be the perfect tool to make long-held idealistic views of science actionable and operational.