The first draft of the piece, "Brief Encounter In The Museum" was written while working at the Lafayette Natural History Museum And Planetarium, during the T.Rex Named Sue Exhibit. There weren't any tours to be given at the time as it was a Saturday. The final draft can be found in Paperwall, Issue 14:
Here's some more information about Sue:
She was about 42 feet long and weighed about 7 tons.
She had roughly 250 bones.
She is the largest and most complete, and best preserved T. Rex (90% complete). The possible reason for this preservation was because she was buried quickly, thus the bones were mineralized sooner than later.
She took your love and then she ran around.
Her skull was about 5 feet long and weighed around 1 ton.
The size of her teeth ranged from 7.5 to 12 inches long.
The distance from the ground to her hip was 12 feet.
She lived during the Late Cretaceous Period and was found nearly 67 millions years later.
About the T.Rex in general--there is scientific evidence showing that these dinosaurs were related to birds, as some were found to have feathers.