crackit open and that's pretty much it ;-)
bad eggs float
you know when you are not cotrolling the car.
It will probably smell bad or have a noticeably weird flavour to it.
You know when french onion dip has gone bad because it has water on the top.
when it does not work
If you eat it and then throw up. ;)
check it
If it is stale and a very light brown and nothing grows on top of it, then you know you have bad soil.
It is safe to eat if it does not contain uncooked/undercooked eggs (whites or yolks) and has not gone bad/stale/off.
It as a dark color and it emits a bad order that is easily recognizable
No not that i know of because my little sister opened a big lollipop two months ago it hasn't gone bad yet but me in general i would not eat it.
Swap it with one you know is good.
Well it all depends if the sound of the engine is abnormal or muffled then it prolly gone bad and if it dont start then well you know its bad