No worries, you don't sound negative- you're questioning it, which is normal and encouraged

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Because unless they move as fast as their ships do. You will bound to bump into them.. Or if they are trying to dodge you and will soon trip over something like a lamp for an example
They'll stay a reasonable distance away, like 5 feet or more. Sometimes, they do trip over something. Which is why sometimes my things will fall from where they are- they tripped over it

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And I dont thin its possible for them to bend the light to make them invisible.
We don't know that yet. If they can't bend light yet, they can always use their minds to trick us into not seeing them.

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And why the hell would they be in your house? Watch you take showers? Is that how they can their daily porno..?
This one had me laughing

But they do it mainly to study us, to get a feel of how our society's like and things like that

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And if they really had this technology.. Why wouldnt they cloak their ships. Save themselves from all the publicity and drama the people cause..?
Because those probably aren't aliens; they're probably government. Either that or they haven't found ways to cloak their ships yet

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They are superior from us.. Why would they need us? Maybe to be slaves? Study our cons and pros? So they can have full control of us? If So.. With that invisible gadget they could easily take our world over in matter of minutes with their ships and shiz..
Maybe, but even though they're superior, we may have some trait they don't have, and they want to study it so in the future they can harness that trait and become better. They can take over the world if they wanted in minutes, but they want to study us some more before they take action

Like I said, it's just a theory, and it might sound weird, but it could be possible