The Big Bang
100

This catchphrase is often used by Sheldon Cooper 

Bazinga 

200

The University where the main characters work 

Caltech (california institute of technology)

300

Howard is a member of this rock band 

Footprints on the moon 

400

The nickname Howard is given by the crew aboard the ISS

Fruit Loops

500

To educate people in vexillology, Sheldon cooper created this long runnint series 

Fun with flags 

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