First of all, I know this is not the kind of questions that usually are done in asklemmy but I don't know where to ask, sorry folks.

It's a 5th generation kindle and I really loved reading on it. :(

Bonus question if the kindle is doomed: best e-ink reader on the cheaper side? I don't want anything super powerful or fancy, I just want to load my collection with calibre and read on it. - bonus points if it's a libre and or open source friendly.

4 ways of using it come to my mind:

• Place hands on the inclined outer handles and do a pull up with arms open wide
• Place hands with palms facing the wall on the "inner" handles and do a pull up with arms at shoulder width
• Place hands with palms facing my face on the "inner" handles and do a chin up
• Place hand on the handles which point out of the wall and do a pull up / chin up (sorry don't know in this case)

Are these excercises different for the group of muscles they target? And if so, how? Is there any ranking among them from worse to better?

Also if I can do chin ups just fine but I can only do negative pull ups, which ones should I choose?

I'm referring to the human race evolving in the African continent and then migrating to the rest of the world.

Evolving in Europe made people light skinned to account for the reduction in sunlight exposure, are there any other traits which other ethnicities developed to adapt to their new environment? Or are the diifferent traits in different ethnicities just stuff that developed by chance and got somehow reinforced because of the isolation between populations?

This question came to my mind first thinking about "Asian eyes", do they serve any "purpose"?

Alternative title: Dinosaurs wouldn't be that big if they weren't that big

Any topic, just explain what it is please

I know evolution is governed by chance and it is random but does it make sense to "ruin" sleep if there's light? I mean normally, outside, you never have pure darkness, there are the moon and stars even at night. In certain zones of the Earth we also have long periods of no sunshine and long periods of only sunshine.

I don't know if my question is clear enough but I hope so.

Bonus question: are animals subject to the same contribution of light or lack of it to the quality of sleep?

The birth (or death) of a relative, the release of a new program, game, series, movie, the date you were dreaming about, could be anything