What did the einstein-szilard letter warn president roosevelt about in 1939?
a. that the us was secretly researching nuclear weapons
b. that germany was researching nuclear weapons
c. that the us planned to use nuclear weapons against japan
d. that germany planned to use nuclear weapons against japan

The correct answer is B, as the Einstein-Szilard letter warned President Roosevelt that Germany was researching nuclear weapons.

The Einstein-Szilárd letter was a missive written by Leó Szilárd and signed by Albert Einstein, sent to the President of the United States Franklin D. Roosevelt on August 2, 1939. Written by Szilárd after consulting with his compatriots and friends, the Hungarian physicists Edward Teller and Eugene Wigner, the letter warned of the danger that Germany could develop atomic bombs, and suggested that the United States should start its own nuclear program. It incited Roosevelt to take immediate action, which ultimately resulted in the beginning of the Manhattan Project and the development of the first atomic bombs.

war never

offline recommendation systems option b

because recommendation systems produce a list of two ways

1. through collaborative filtering

or

2. through content-based filtering