TASK DEFINITION: Given a travel related situation, and given a specific question about the situation, summarize the question into a title
PROBLEM: I appreciate we need to carry both passports at all times and I have been doing so except, due to a distraction, this time I forgot my old passport at home in the US. I am due to fly back soon, which rules out having my old passport mailed to me. 

What are my options to go back into the States?

If it helps, I have scans of all documents with me, including the photograph and visa page from the old passport as well as the I-129s form I'm always supposed to carry.


SOLUTION: I am travelling with a renewed passport and my US visa is in my old passport which I forgot in the US. What are my options?

PROBLEM: I am thinking about buying a smartphone while in Tokyo.

Do you have any physical store (I leave on Monday morning) to recommend?

I've already been to Yodobashi, where they showed me about 15 models.


SOLUTION: Where to buy unlocked smartphone in Japan?

PROBLEM: Came across a YouTube video from July 2008, where a Russian border official on a night train from Ukraine checks a big logbook before stamping the passenger's passport.

What is the purpose of this, and is it still common practice?


SOLUTION:
What does Russian border control use big logbooks for?