Hi again,
71. You are probably thinking too deeply, it's like "heatwave" in the sense it's an everyday term particularly in the summer. 3 letter star!
78. I had never heard the term before but "misleadingly" it's a type of snow according to wiki;
1st word: 50% of software, 2nd word: initially = the 1st letter of a word inside "HAL". Too easy now?