They say few things in life are guaranteed but you can count on death, taxes, and, every five years, the Census.
Anyone could be forgiven for being surprised upon discovering the official, government seal-stamped letters had been dropped into letterboxes across the country last month.
The way time has been flying, it might seem like only yesterday that Australians sat down dutifully on an August evening and filled out the questionnaire that reveals so much about our nation.
But no, that was 2016, believe it or not. We all know a lot has happened since then.
For many, it might simultaneously seem like five minutes and yet a lifetime ago that the pandemic arrived and held on tight, only to strengthen its grip on Australians even more in recent months.
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But today is a chance for a few moments of normality that will not only help record this moment in our history, but also shape our future.
It's finally the official Census night.
Sure, it's compulsory, but it's also a little exciting.
The information Australians provide tonight has an impact on decisions about transport, schools, health care, infrastructure and business, and helps plan local services.
It must be filled out, answering questions about everyone at your address on the night of August 10 - including visitors and babies. If you don't, expect a letter or a visit.
Statisticians predict an unusual snapshot will be captured, with a mix of pandemic-specific and longer-term trends.
If you've not arranged a paper copy, head online with the magic numbers and password provided in that orange and aqua-themed envelope found in the mail a few weeks ago.
If you need help, visit census.abs.gov.au/help or call the 24-hour automated service on 1800 130 250.
More than 2.4 million Australians had already completed the census by Monday morning.
Take some time during the day to make your mark on our future.