Whenever you see an old-timey group photo, the subjects always look moodier than a teenager at a garden centre.
And before today, we put it down to the past being a bit rubbish. After all, they didn't have the internet, or Soccer Saturday, or McDonald's chicken nuggets - they had every right to be angry.
But according to Vox.com, there's a far more reasonable explanation for the phenomenon. According to camera heads, retro cameras' long exposure times meant that shooting photos took minutes at a time. People couldn't hold their smiles for that long, and it would have inevitably led to blur.
The steely-faced look was also influenced by classic paintings, amongst other things. Check out the video below for the full explanation...
Get exclusive shortlists, celebrity interviews and the best deals on the products you care about, straight to your inbox.
-
From puffers to parkas: The must-have jackets and coats doing the heavy lifting this winterThese are the outerwear heroes keeping you warm, dry and effortlessly stylish this season
-
From Lincoln to Phantom Thread: The 7 films that prove Daniel Day-Lewis is untouchableFrom epic historical figures to intimate character studies, these roles showcase why Day-Lewis is one of the greatest actors of all time