I've already done this on someone else's video—but—to the first person—the shrinking idea—please watch Puchimas!! Petit Petit Idolmaster episode 62—i—it's kinda the exact opposite of your idea, but I don't care. But—very original idea. I would not in a billion years ever think of a lack of water causing us to shrink. It's a super fun way to commentate on global warming. So, does the shrinkage occur rapidly? Or, is this how humans have evolved over many years?—favoring smaller sizes to require less water and energy. How has society changed? Is there anyway to bring back the water? Next—yes—underwater humans are delightful. I suggest you watch Weathering With You, Ponyo, Ride Your Wave and Tomorrow's Leaves for inspiration. Maybe Lu Over the Wall and Origin: Spirits of the Past, too. Also, Big Fish & Begonia and Children of the sea—both of these ones are unbelievably boring and what I term "fake deep"—really just another way to say bad—but they're really pretty. So, they do have that going for them. None of these exactly cover the idea of humans living underwater, but there's a lot of cool water stuff, so—yeah. Anyways, have humans always lived underwater in this world? Have they evolved to breathe underwater? Or, do they all wear diving equipment and such? What drove them underwater? Is the land still habitable? Or, is there a danger above? Moving on—chip implants. Very unsettling—very awesome—gives off a nice cyberpunk dystopian feel. Are the chips administered by the government? Do all people have to get these implants? How are these chips implanted? What happens if you resist? What is the "information" that you refer to? What's being installed? Try watching the World of Tomorrow film series—it's very high-concept and weirdly deep and undeniably cool. Last one—humans without individuality? Hive mind? Hot diggity. Very cool. I'm reminded somewhat of the Borg collective from Star Trek—specifically, Star: Trek Voyager—go watch it. It's the best one and I will FIGHT anyone who disagrees with me. Anyways, super interesting—are people aware that their thoughts are the same? Or, are they all curious about what the other is thinking, even though the thoughts are identical? How good is their teamwork? Are their thoughts themselves exactly the same? Or, is it their way of thinking that is identical?

The idea I found most interesting was what if humans learned and thought the same way?
It makes me wonder more about how humans are so different and have so much individuality, and how that is possible.

these what if's need a little work but there good

Fantastic submissions, the idea I found most interesting is both the water one and the chip in brain....the chip in brain one makes me wonder what they learn each year and WHAT IF....someone got the wrong chip by accident???? could be a fun story

All these ideas have potential but I thought the idea about getting a chip with knowledge had me asking the most questions about what would happen. Would people lose their motivation to learn, or would they have plenty of time for learning just the stuff they were really interested in? Would your brain start to decay because it isn't being used. Lots of directions that could go.