The Answer: For years people have looked at 12th century medieval glass windows and determined that the reason some are thick at the bottom is that over time gravity causes the glass to "flow" towards the bottom of the frame.
(people; have looked; at 12th century medieval glass windows; T:For years) (some; are; thick; L:at the bottom) (people; determined; that the reason some are thick at the bottom is that over time gravity causes the glass to "flow" towards the bottom of the frame; T:For years) Context(people determined,List([22, 94))):(the reason some are thick at the bottom; is; that over time gravity causes the glass to "flow" towards the bottom of the frame) Context(people determined the reason some are thick at the bottom is,List([22, 142))):(gravity; causes; the glass to "flow" towards the bottom of the frame; T:over time) Context(people determined the reason some are thick at the bottom is gravity causes,List([22, 172))):(the glass; to flow; towards the bottom of the frame)
people determined,List([22, 94)) people determined the reason some are thick at the bottom is,List([22, 142)) people determined the reason some are thick at the bottom is gravity causes,List([22, 172))
people some people the reason some are thick at the bottom gravity the glass
have looked are determined is causes to flow
at 12th century medieval glass windows T:For years
thick L:at the bottom
that the reason some are thick at the bottom is that over time gravity causes the glass to "flow" towards the bottom of the frame T:For years
that over time gravity causes the glass to "flow" towards the bottom of the frame
the glass to "flow" towards the bottom of the frame T:over time
towards the bottom of the frame