Will Trump lead to the downfall of the USA?

His presidency will certainly set the stage for what the 21st century will ultimately look like.

If you look back at history, you will see that the definitive character of any given decade is established only in the third year or so into it—as though people need time to assimilate that a new decade has been ushered in: the Fifties only began after the Korean War and the death of Stalin (1953); the Sixties only got swinging with the assassination of Kennedy in Nov 1953 and the Beatles’ appearance on the Ed Sullivan Show three months later; the Seventies with the Yom Kippur War (1973) and the oil boycott that followed—etc. etc.

Why did medieval Jewish scientists write in Arabic instead of Hebrew?

 

Rabbi Moshe Ben Maimon (Maimonides)

This is not true of all Jewish medieval scientists—only those living in the Arab world (the Middle East, North Africa, and Spain-Portugal), where of course Arabic was the lingua franca.

Arabic was also the language in which the ancient writings of ancient Greece and Rome—particularly those related to science, medicine, and non-religious philosophy—were preserved during the Middle Ages while Europe was mired in endless internecine warfare, and the only literate people (mostly Christian monks and clerics) were absorbed exclusively in Christian theology. Hebrew was used by Arab Jews mainly for prayer, study of the Hebrew Bible and Talmud, and communication with other (mainly non-Arab) Jews.