No.
Sneak it in.
Invent mean that you make the object all by yourself without anyone knowing it, but discover means that someone already made that object but you just find without anyone knowing it.
Don't tell anyone
Exercise with nobody around
don't tell anyone
You can hire a private detective and he'll search for him for you
cellphone
Through ultrasonic voices TV radio media etc.
If the account is not protected then you can view it without anyone knowing.
Impossible to answer without knowing which counts were what.
You can use YouTube without anyone knowing its you, This can be used to get on Blocked Sites at School or Work.
You are discreet about it and don't make a fuss or call attention to the purchase.