アルベルト・アインシュタインさんのインスタグラム写真 - (アルベルト・アインシュタインInstagram)「The mysterious radioactive element einsteinium has been measured for the first time. It is the 99th element on the periodic table. Named for legendary physicist Albert Einstein, einsteinium has been one of the most challenging elements to study since it was discovered in 1952. Read all about it in this article in today's New York Times: www.nyti.ms/3pYi929 @nytimes」2月8日 23時10分