Unsolved Problems in Metallurgy. By R. A. Hadfield. Join Our Community of Science Lovers! Sign Up for Our Free Daily Newsletter. Enter your email.

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One of the oldest unsolved problems On June 7, 1742, Prussian mathematician Christian Goldbach wrote a letter to Swiss polymath Leonhard Euler.

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11 Unsolved Problems in Climate Change. Posted: June 12, 2025 | Last updated: June 15, 2025. What are the gaps in our understanding of climate change? More for You.