I have two ways of explaining. The first one is just saying “I work with data” followed by some hand waving and shrugging.
The other is where I really go into detail and explain everything. Going gaga over some minute aspect that I find awesome but couldn’t even interest one of my coworkers.
Neither seems to really work, but I don’t get follow up questions which suits me just fine :)
The first house in my city is from 1976, the entire city is built on reclaimed land. It went from 100 residents back then to more than 220,000 now.
A fun fact is that they still find stuff in the ground from old shipwrecks to crashed WW2 bombers.