Complete the sentence about Stanisław Ulam with the correct year: In January ______, Ulam and Teller came up with the Teller–Ulam design, which became the basis for all thermonuclear weapons.

Answer and explanation

Correct answer: B. 1951

In January 1951 Ulam and Teller came up with the Teller-Ulam design, which became the basis for hydrogen bombs.

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