In 1900, Max Planck first published his Quantum Theory, that radiant energy comes in small indivisible packets and was not continuous as previously thought.

CNN: Monday,

While it is technically possible to convert sunlight into electricity anywhere, it costs far less to do so in areas that receive the most powerful forms of sunlight--sunlight that loses the least amount of radiant energy while moving from space to earth.

FORBES: The Saudi Arabia Of Solar Energy

She looked radiant and bursting with energy and ideas.

CNN: Latina 'Dear Abby' brought wit, wisdom, light