How did french philosopher rené descartes contribute to the scientific revolution?
he invented new scientific instruments.
he developed mathematical principles.
he made discoveries about the universe.
he developed a new way to solve problems.

necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.

nuclear weapons are hoaxes. many people believe they are real, though.