People with Mercury in Gemini are very quick witted and smart. They will have some or other knowledge about many things and can prove to a very good resource to gain facts about things and people at large. Their mental process seems to working faster than others all the time and they come up with the answer very fast. They are very logical in their approach and will always put logic above emotions. They can change their point of view very often and start believing in something else. They can spot the weak points of an individual and can play around with him on those issues. Their presence of mind is very good.