Scientists find 16 “ultra-black” fish species that absorb 99.9% of light (photo)
These alien-like creatures are virtually invisible in the deep sea
Italian artist sells invisible sculpture for more than $18,000!
"Vacuum is nothing more than space full of energy & even if we empty it according to the Heisenberg uncertainty principle that 'nothing' has weight"
Invisible ink on antique Nile papyrus revealed by multiple methods
The Egyptians would carefully roll up or fold together letters, contracts and amulets to a tiny size so that they would take up the least possible space