Question

I can travel where there are no molecules, but never through a brick. I can travel through space, but never around a corner. What am I?
drwls
light (a photon)
Anonymous
Light
Anonymous
light
mackenzie
i got the same question to
mackenzie
i got the same answer to
julie
light
Anonymous
Light
cayden
light
tristen
the answer is a postal card
kaylee
I have the same answer but i can't find it.