Since this series is called »Quick Tip«, I am indeed going to try and make it quick: Last week, Mum dragged me into a small shop for domestic needs, demanding I’d help her to pick a new tea service. Needless to say, it was pretty boring, but I found a set of cheap plastic measuring spoons there that I bought — not for my kitchen, mind you, but for my sunscreen. (Yes, I need help.)
Naturally, the first thing to do when I got home was to take out my interim SUNDANCE sunscreen (I’m still waiting for two new bottles of Bioré to arrive) and measuring up 1,25ml ≅ ¼ tsp of it — approximately the amount the average person needs to sufficiently cover their face.
If you’ve been reading my blog for a while, you know that I’m a very strong advocate for using the proper amount of sunscreen — it’s so bad that my friends actually gave me the nickname »Sunscreen Nazi«. I always try to put on as much as possible before I leave the house (although some formulas are a real pain in the ass to work), because, as we should all know by now, sunscreen not only is the most effective wrinkle prevention humanity currently has at hand, but also prevents melanoma, aka skin cancer. And even if you’re in the hardcore »natural/organic« camp, believe me, you don’t want to get skin cancer.
But I promised to keep this short: So, I filled the ¼ tsp to the brim with sunscreen, — now imagine my shock and horror when I saw the full measuring spoon, and realised that the amount I had been applying for years, thinking it was 2mg/cm², was in fact more like 1mg/cm².
It doesn’t look like much of a difference, but those of you who are educated about sunscreen will know that the protection factor drops exponentially when you don’t apply enough sunscreen: 
TL;DR — Don’t be a moron like me; get yourself some measuring spoons now.
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 Pinnel, Sheldon R.: Cutaneous photodamage, oxidative stress, and topical antioxidant protection. 2003, p. 4