No improvement to this sentence is necessary. It makes perfect sense on its own and sounds right. "Either" always takes an "or" else the word wouldn't make sense, as it's meant to contrast binary options.
eg.
I'm either going to eat food or drink water.
Answer:
How long Did the party last?
Answer:
Facts from a study showing how video games improve coordination
Explanation:
The article is about benefits of playing video games, a study showing that they improve coordination would provide evidence of benefits from video games
A stronger dollar means U.S goods are more expensive in foreign markets. Imports are More affordable Global U.S companies are less competitive
Because they are unique, which in turn makes the book unique.
Hope it helped,
BioTeacher101