an open secret
a secret that so many people know about that it is no longer a secret
It is an open secret that I will be leaving my company next month.
Handy Health Advices
The most important source of calcium and Vitamin E, and salmon is the best choice. Sardines and canned tuna are two other types of fatty fish that are very rich in calcium. Make sure to include this in your daily diet if you have calcium deficiency.