The police are now monitoring criminal/gang/drug 'activity' in the area.
There has been an increase in the city's (level of) economic 'activity'.
The instruments are used to detect volcanic 'activity' on the island.
(..) Yeah,sit down. Now close your eyes. - Why? - Just do it. Okay. Now try to increase your alpha wave activity. What? ! It's a biofeedback technique. It's relaxation through brain wave manipulation. I read a paper about it in (..)2007 TvShow: The Big Bang Theory Title: The Fuzzy Boots Corollary Season: 1 Episode 3