Question: What university did the public speaker who talked about Energy development attend?
Answer(s):
answer: Harvard Law School
answer: Columbia University
answer: Occidental College

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ?c)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
?c ns:event.public_speaker.speeches_or_presentations ?k .
?k ns:event.speech_or_presentation.speech_topic ns:m.02mg6f . 
?c ns:people.person.education ?y .
?y ns:education.education.institution ?x .
?x ns:common.topic.notable_types ns:m.01y2hnl .
}