system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why do we have such a strong urge to scream out when we're injured. It seems like the last thing we'd want to do from a survival standpoint is to alert others of our weakness.

Edit - a lot of posts on here are saying that there is an evolutionary advantage to having an animal scream out because it warns the other members of the tribe, and, though it may lead to the animal being killed, it's better for the tribe as a whole. 

I'm fairly sure that can't be true. Evolution only works in the interests of the individual, not the group (at least, not if it means sacrificing the individual). Evolution is about passing on your genes to the next generation. That's all it is. If the individual dies, they can't pass them on. That's survival of the fittest. True - screaming out may help the tribe, but if it leads to those genes dying, they don't get passed on.



Editing my edit - apparently I'm wrong. Some know-it-all named Richard Dawkins wrote a book about how sometimes evolution can work for the interests of the group rather than the individual. Learned something new. That's what I love about reddit.
gpt
Humans are communal animals. Screaming alerts the rest of the tribe to the danger. It may or may not save the injured individual, but it definitely helps the group as a whole. Since genes are what matters, not individual survival, behavior that makes other close relatives more likely to survive is more likely to get passed on.