“Dad, is it really so that mass depends on energy?”, C. Adler, an American physicist was asked by his son.
“No! Or rather - yes. Actually it doesn’t, but don't tell your teacher about it”, C. Adler answered.
The next day the physicist’s son stopped studying physics.
From the article by L.B. Okun, published in the “Advances in Physical Sciences”, vol. 158, issue 3, 1989, pp. 511-530
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