What is the only substance Superman cannot see through?

What is the only substance Superman cannot see through?

Lead

Asbestos

Titanium

Vibranium

Back before comics books targeted more serious-minded readers, they were a jumble of made-up, sciencey concepts. Superman’s ability to see through objects with crystal clarity and occasionally melt them with heat vision were both attributed to X-rays, even though that’s not really how they work at all. Real X-rays cannot penetrate lead, however, and writers latched onto that fact to keep Supes from being all-powerful.

Answer: The correct answer is Lead

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