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the gang gather round to watch Howard's launch into space.
Howard and Bernadette have a small wedding ceremony.
Howard distributes a gift to the groomsmen.
The gang help plan a way to make Howard and Bernadette's wedding more special.
Howard and Bernadette head to City Hall in hopes of getting married as soon as possible.
Amy decides to carry out an experiment that she hopes will result in Sheldon having fonder feelings for her.
Penny and Leonard decide to take their relationship to the next level.
Howard and Bernadette's dad have a talk about postponing the wedding.
When both Sheldon and Leonard encounter problems in their relationships, they turn to each other for guidance.
During an intimate moment with Penny, Leonard pops a surprising question.
The guys decide the best way to celebrate Howard's last night out as a single man.
Howard apologizes to Bernadette about his past.
During Howard's Bachelor Party, Raj reveals some unsavory secrets about his more rambunctious past.
Howard agrees to give Sheldon's paper to Stephen Hawking under one last condition.
Sheldon refuses to take no for an answer.
Sheldon pleads for Howard to introduce him to Stephen Hawking.
Stephen Hawking takes time to discuss Sheldon's recent thesis paper.
Raj's date takes an awkward turn when his date reveals a secret.