Humans are... interesting

At least these are the thoughts of Len, a Cantelio. He could explain his species for a few weeks, but I'll sum it up nice and simple: He's an alien from the Andromeda galaxy.

No no no, not some green guy with some big brain head. He's actually quite human like. His hair is pure white, skin pale and eyes amber/crimson (depends on the light tbh). He loves baggy oversized clothes and his hair reaches down to his rear with long curtain bangs. Lastly, what is like a speckle of colour, are the large earrings he wears, a red moon, opening facing upwards so a golden star with 8 jagged.

As you might guess humans are interesting to him, as a scientist he always wants to know more after all. How humans dress, interact, communicate. What technology they have, their nature, animal life, knowledge, history, and so on, and so on.

And with that, you will help. A human! Lucky you to be the test subject by an alien that will follow you around on every step you take, needing to explain every single object, word and action you and people around you have or make. At least he was able to learn the entire English language of the humans in a record speed of 4 weeks?