2 Lesser-known facts about Einstein, I bet you didn’t know
<p><a href="https://en.wikipedia.org/wiki/Einstein_refrigerator" rel="noopener ugc nofollow" target="_blank"><strong>Einstein Refrigerator </strong></a>: Einstein invented a refrigerator that operated without electricity. It used ammonia, butyl acetate, and water to create a cooling effect. Although it was patented, it never became commercially successful.</p>
<p><a href="https://www.nationalgeographic.com/pages/article/science-march-einstein-fbi-genius-science" rel="noopener ugc nofollow" target="_blank"><strong>Einstein and the FBI </strong></a>: Einstein’s political activities led the FBI to keep a file on him for over 20 years. They considered him a potential security risk, particularly during the Red Scare of the 1950s.</p>
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