I’ll piggy back off of another answer and say I would also develop a gadget to go back in time.
The difference is, it would be a scanner to scan artifacts (scan so we don’t risk touching and breaking it), and it would allow us to go back in time to the time it was made and see the world as it was. It would also allow us to speak any language relevant to the time and place the item was created.
Or, you could scan a tombstone or place where a historical person lived, and be able to speak with person.
Oh, the questions I have…
Thank you Kathryn for your participation