Problem: Does "Challis later realised that he had observed the planet twice, on 4 and 12 August, but did not recognise it as a planet because he lacked an up-to-date star map and was distracted by his concurrent work on comet observations." answer the question "Who was Henrich d'Arrest?"

A: no

Problem: Does "John enjoyed reading and, unusually for the period, built up a travelling library of books." answer the question "What did John build up?"

A: yes

Problem: Does "Technical details of Sony's digital audio disc were presented during the 62nd AES Convention, held on 1316 March 1979, in Brussels." answer the question "Who was the general manger of Sony's audio department in 1971?"

A:
no