This text is missing some spaces, please add them: AdebtthatHalmosowestovonNeumannisthatoneofhislecturecoursesinspiredHalmos'sfirstbook.
A debt that Halmos owes to von Neumann is that one of his lecture courses inspired Halmos's first book.

This text is missing some spaces, please add them: MarkSt.JohnNewellwasanAmericanwhohadtriedformanyyearstofindaphotographyschoolintheUSAbuthadnevercometoonethatsatisfiedhim.ADanishgirlfriendsenthimatranslationofFatamorgana'sbrochure,andheimmediatelybecameallfire:thatwastheschoolhehadbeenlookingfor.HewasacceptedasastudentandmovedtoDenmark.HedidnotconsideritaproblemthattheclasseswereinDanish.Hewouldtapewhatwasbeingsaid,andintheeveninghisgirlfriendwouldtranslate.
Mark St. John Newell was an American who had tried for many years to find a photography school in the USA but had never come to one that satisfied him. A Danish girlfriend sent him a translation of Fatamorgana's brochure, and he immediately became all fire: that was the school he had been looking for. He was accepted as a student and moved to Denmark. He did not consider it a problem that the classes were in Danish. He would tape what was being said, and in the evening his girlfriend would translate.

This text is missing some spaces, please add them: Melatoninhasbeenusedforsleepdisorders(e.g.,insomniaandjetlag).
Melatonin has been used for sleep disorders (e.g., insomnia and jet lag).