Yes and no. Obviously they'll eventually spoil but eggs are naturally pretty reislent and will usually last two or three weeks unrefridgerated (great news for backpackers!). This is due largely to natural antibactierial qualities in the shell. Temperature, the health of the chicken that laid the egg and the density and state of the shell (ie: cracks) will all effect longevity. A good rule of thumb is if it smells rotten, it is rotten (hence that "rotten egg" smell), otherwise enjoy!
Eventually, yes. They will in all likelyhood last longer than if outside of the fridge. how long they last depends on how long it was since laid and what temperature they have been stored at since. You can always put on in a pot of water before cooking if unsure whether it's spoiled or not. if it sits at the bottom horizontally it's ok, ifit's at an angle on the bottom it's begining to turn, if it's vertical it's pretty bad but you could take your chances, if it floats throw it away as the gasses from bacteria eating it have made it float, meaning there's a lot in there. And salmonella is common in eggs and poultry in general.
Yes eggs go bad.
Only if they have kept them in a fridge since they picked them and brought them to the store. if they have kept them in room temperature (you will see that when you buy them in the store) you don't have to keep them in the fridge. I asked the owner on my grocery store at home once because they left the eggs out in the store and not in the fridge.
Not necessarily. A lot depends whether they have their natural coating, which is often removed during processing. With it unprocessed eggs can stay out even for weeks. When you open the egg, check that the yolk holds its shape and that the colors look normal. Smell it too. But if you can refrigerate, do.
if they are not cracked anywhere, do not put anything on top of them because then they will crack
Yes, gravy will go bad if not refrigerated. The pH and water activity are not low enough to make it shelf stable without a canning process.
Yes. After baking (or mixing no-bake cheesecake), it should be refrigerated promptly. Baked cheesecake contains eggs, cheese, and sometimes sour cream, which will all go bad very quickly if stored at room temperature.
Of course milk needs to be refrigerated because if you don't refrigerate it, it will get chunky and go bad.
You can keep brown eggs refrigerated for at least 2-4 days.
They never go bad. Ever.
As long as it stays refrigerated, it should not go bad before the expiration date. If it's left out, it should be eaten the same day. Depending on tempertaures, you could go another day, but I personally wouldn't.
yes after a while. if you want it to last longerput it in the freezer
No, unless mixed, than it needs refrigerated.
Blackberries do need to be refrigerated, or else they will go bad
they might
All penicillin will go bad after a period of time, but it is actually better to keep liquid penicillin refrigerated. It is a good idea to check the expiration date on your penicillin, and dispose of it when it expires. Penicillin that has gone bad will not help you, and you should be careful with medications that are past their date.