This habit had stayed with him, though the lab had nullified that somewhat.
" He has a wide variety of hobbies, including surfing, scuba diving, and numismatics (the study of money - in the episode Precious Metal his knowledge of the subject helps the investigation along).
Greg has mentioned on several occasions his grandfather, whom he affectionately calls 'Papa Olaf.' He also mentions his Nana Olaf in season 6, episode 19 (Spellbound).
She apparently possessed psychic powers, and his family believes that Greg may have inherited this ability from her. Although friends told him that science was for geeks, Greg knew that he wanted to become a scientist.
He would wait until the night (or even the morning) before class to do his homework.Greg could be considered the most "normal" member of the CSI team.Since he is still fairly young, he hasn't been fully subjected to the horrors of this job like the rest of the team.He is also not concerned with the financial aspect of a job -- just the joy that it brings.He has however become somewhat jaded as time has gone on as things affect him less than they used to.
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In Coming of Rage (season 4 episode 10), it was revealed that he had a palate expander, braces, a retainer, and head gear while growing up.