アルベルト・アインシュタインのインスタグラム(alberteinstein) - 11月12日 02時37分

On this date in 1915, Einstein submitted the second of his four papers on general relativity. This paper is an addendum to his very first paper on general relativity, which was published on November 4, 1915. #ThanksEinstein

[BIHAKUEN]UVシールド(UVShield) 更年期に悩んだら

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