Q: Has Elon Musk's hairline changed?
A: yes
Explanation: When Elon Musk was much younger, he was clearly balding. Elon Musk does not show any signs of balding as of 2020.

Q: Can the US branch of government that has power over the military also have the power to veto?
A: yes
Explanation: The US President is the commander in chief of the US military. The executive branch of the USA includes the President. The President has power to veto.

Q: Did eggs need to be kept cold in the middle ages?
A:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
no
Explanation: When eggs are freshly laid, they are covered in a film called a 'bloom.'. Eggs with their bloom intact are able to stay at room temperature for one month. Pasteurization destroys the bloom on eggs. Pasteurization was introduced in the 1990's.