Here are some ways to stay safe:
yes
bowser is in his castle in the dark world
No.
No you dont have a bug.
Mold-no
Yes, you can.
It had provided a safe haven during the Dark Ages
no because it can blind you
The object is safe to touch, as it does not emit heat enough to harm the skin. The substances used to create this "glow in the dark" effect is generally toxic, and should not be consumed.
in a dark wet safe place
They are relatively safe, though they likely use a lightly radioactive substance like radium.
Yes they are, seeing the bottom of a dark bottomed pool is not difficult at all contrary to the opinions of some