Sheldon becomes concerned that his family's recent yard work has created a re-entry problem, where the trajectory of a thrown object could potentially harm someone. Meanwhile, Missy tries to convince their parents to let her build a treehouse.
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In the climax of the episode, Sheldon tests his re-entry minimizing contraption, only to have it backfire and cause more chaos. Meanwhile, Missy's treehouse is finished, but Sheldon warns everyone that it's a re-entry danger zone. Sheldon becomes concerned that his family's recent yard
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"Dark matter is an invisible form of matter that makes up approximately 27% of the universe," Sheldon said, using his hands to gesture. "It's like a big ol' cosmic game of hide-and-seek, and we're just starting to figure out the rules."
As the episode progresses, Missy's treehouse starts to take shape, with the help of her friend, Olivia. However, Sheldon becomes increasingly paranoid that the treehouse is a re-entry hazard waiting to happen.