UNKNOWN

Everything in the world depends on absence and presence. A strong presence will draw power and attention to you—you shine more brightly than those around you. But a point is inevitably reached where too much presence creates the opposite effect: The more you are seen and heard from, the more your...

There are also other celestial sources of UV radiation.

Very large young stars shine most of their light in ultraviolet wavelengths. But the Earth's atmosphere blocks much of the UV radiation, and observations are conducted using high-altitude balloons and special orbiting...

Some fears are acquired based on specific life experiences. Other fears are more universal, like the fear of darkness. 

Darkness leaves us vulnerable and exposed, unable to spot any threats that may be hiding nearby. Darkness means danger, and fearing it means taking p...