Both forms are possible. Some verbs, including "be" (is) can be followed by either a full or a bare infinitive.
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Jay from earthwhat it really does is divides us.This comes under the topic of "Pseudo-clefts with do".
Jay from earthbut,the bare infinitive form is divide, why divides here? I meant either "...is to divide" or "...divide" in this sentence.I thought you would be able to extrapolate from what I gave you. Let me repeat:
Jay from earthI really cannot believe the error occurred from TED official website.You are free to believe whatever source you wish to believe.