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  1. S

    I want to take a form of martial arts, but which one?

    I want a form of martial arts where it can be used to defend myself. However, i also want to protect my friends and family so the techniques must also enable me to strike first at times. (ive been a victim of bullying, and my neighborhood isnt very good) I want to start have a sense security of...
  2. S

    Based on the discharge spectrum emission how can we tell fluroescent light has mercury?

    and incadescent light doesn't?
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