Science geeks are NPCs featured in The Sims 3. They are usually seen when a newly bought house has been invaded by bugs. They come and ask the house's owner if they can take the bugs in order to study them. Most usually have the Computer Whiz trait, though there are some exceptions, such as Griffin Torrent.
They also appear on these occasions
Indian Burial Ground Meteor Crashed Everything broke Infested with rats or Flood