Hello,
-- I'm from the 2040 year, as of that point of year, I'm already 39 years old after I departed to the 2013 year.
-- I'm not a scientist whatsoever, but I created my own portable time traveling device/machine, so that's probably the only technology-related object that I made!
-- Everything would be digital as of the 2040 era. But I could speculate that everything would turn virtual as of the latter half of the 2040 era.
-- I don't fully understand the fourth question you've asked me, but to summarize the confusion; I don't have anything interesting in particular though, aside from my experiments on the aspects of time traveling and such which has given birth my wonderful non-fiction novels.
-- I can't clearly describe on how my own time traveling machine looks like, but I guarantee you, it would fit in your fingers and hands!
And regarding the existence of aliens in my own timeline, it's existence is still a mystery to be honest.
-- I'm not sure if the mentioned people has finished yet, but I reckon there's a pair of scientists and science investigator currently inspecting on the existence of wormholes.
Ahah, it's actually because of people would actually misuse time traveling machines to be honest.

Some would go back in time to change the history in a bad way and such, so that's actually why the government has banned a public access to time traveling machines they had!
But over the time though, there are some people that are trying to make a duplicate of time traveling machines the government and the military already had, and almost every single of the duplicates they've made cannot be used whatsoever.
No problem, and have a good day my good sir!
R