burdensome questions

The following questions have been bothering me lately. I have not yet found solutions or responses that are anything more than vague, abstract conclusions & observations about potential truths. However it is imperative they are listed and over the long-term an answer is an expectation that ought be met. As mentioned previously, eloquence is a process, as is the (currently unmeasurable) idea of wisdom. It is of no surprise that at my young age, despite the immense amount of research & observation accumulated, that there are many questions without answers. These are the ones that address skepticism, cynicism, apathy and pessimism most generally.

Implementation of thoughts into the most widely used human tool: language.

What are the long-term effects of light-pollution?
Are people really so unaware that they need visual cues for stopping & going? (e.g. streetlights, road signs, warning signs, etc.)
Why are certain people able to communicate with their own species better than others?
Why are certain people unable to communicate with their own species at all?
What is the cause of apathy?
Why are some people convinced that their own beliefs, standards, opinions are accurate and thus do not question their methods?
What does having an ego mean? … And is this an extension of consciousness, language, culture, personality, psychology, Darwinism ideology?
When does a person recognize and embrace the idea of death, and come to terms with the concept? Is it a significant memorable moment, or simply an advancement of time?
What does the word “intelligence” mean and are the methods used to test the brains efficiency accurate?
Why do we insinuate/assume so frequently negative, selfish, greedy intentions of others?
Who in the population tends to find success and what types of strategies are the most effective?