You Are Born With All The Brain Cells You'll Ever Have!
Wrong, but this one is really science's fault. Until very recently everyone believed this to be true, and it was the kind of single-sentence advice that propagated from parents to children very effectively, since it was a great official-sounding reason behind valuable common sense.
So what you're saying is that you always have to go when around jellyfish.
radar DOES NOT DEPEND on sight - you dont "see" except on your screen - radar is based on "sound" NOT "sight" - day or night - radar works.