What are some things that you strongly wish were common knowledge?

[Silver]

My psychiatrist and I strongly suspect my psychotic disorder was caused by, or at least made significantly worse, by me taking paracetamol together with high doses of caffeine (because I have read that it can relieve me of a bad headache). So, please, don't do that! Many websites will warn you against taking paracetamol together with alcohol, because it damages your liver in a way that can easily kill you. But I have not seen anybody warning you against taking caffeine and paracetamol together, and that is also dangerous.

Ibuprofen is my drug of choice since I discovered aspirin gives me gout flareups.