Final answer:
One surprising power of Congress is the power to raise and support armies. Another power not explicitly listed is the power to regulate internet commerce.
Step-by-step explanation:
1) One surprising power of Congress listed in Article I Section 8 of the US Constitution is the power to raise and support armies. This is surprising because it gives Congress the authority to fund and maintain a standing army, which was not common in many democratic nations at the time of the Constitution's drafting. This power reflects the framers' concern for national defense and establishing a strong central government.
2) One power that is not explicitly listed in Article I Section 8, but for which there is Federal involvement, is the power to regulate internet commerce. While the Constitution does not specifically mention the internet, Congress has authority under the Commerce Clause to regulate interstate commerce, which includes online transactions and activities.
Learn more about powers of Congress in the US Constitution