It does not disappear because you don't blink when you are looking at it. It does because of relative motion of the Earth relatively to the Sun.
Naphthalene or moth balls sublimate(change from a solid to a gas) so they can "disappear" without wetting the clothes.
diet
No it is not a light source but a light trick a light source produces light
Well a rainbow is just a refraction of the sun's light caused by water molecules in the air. Yo do not need rain to see a rainbow-like object, but you definitely need the sun.
Toilet deodorants slowly dissolve on every flush and release a pleasant smell, while also killing germs.
Guineapigs can go at least 6-9 hours without blinking
probably with lots of practice or mabey a stunt double
Blinking ;)
he's dead
Yes, to stare means to look at someone or something for a long time without blinking. It usually implies a fixed gaze and can sometimes be considered rude or intrusive.
Objects do not simply disappear without a reason. Nor can an object be made to appear without reason
yes
Snakes have clear eyelid covers, but they too must wash the dust from their eyes by... blinking. I suppose it is possible that there are species of fishes that do not blink.
melt it
However long it takes from them to stop blinking to the time it takes them to start blinking again.
The longest recorded time a human has gone without blinking is 1 hour, 5 minutes, and 11 seconds. This record was achieved by Julio Jaime from Colorado, USA in 2016.
snow