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Ordinary matter, like the Earth or Sun, can generate only attractive gravity, but the math revealed that a more exotic source — an energy that uniformly fills space, much as steam fills a sauna, only invisibly — would generate gravity's repulsive version.
In parts of Europe they are still shunned as disruptive outsiders or patronised as little more than an exotic source of music and dance, but Gypsies have ancient roots that stretch back more than a millennium, scientists have proved.
Here is a colorful setting in a slightly burnished, early-modern past (as in "Hugo Cabret"); a mysterious invitation from an exotic source to propel the narrative (as in "Harry Potter"); and a preadolescent boy hero, with several eccentric friends and a single trusty, if grumpy, older person to consult (as in... well, as in too many tales, old and new, to enumerate).
Abazajian cautions, however, that the gamma rays could emanate from a less exotic source, such as previously undetected pulsars.
Among these "exotic" source populations, we will focus on the nature of two classes of hard X-ray sources: those characterized by high X-ray-to-optical flux ratios – a fraction of these are associated with the rather elusive Type 2 quasars – and the X-ray bright optically normal galaxies, also known as XBONGs.
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To hear something fresh, we must scour ever more exotic sources of world music.
Having excavated ancient Greece and Egypt, they were looking for ever more exotic sources to fill their new museums.
"Like many of the avant-garde artists of her time, Jeanne turned to exotic sources, like African art and ethnic objects for inspiration," Ms. Chassard said.
Echoes of Klee, Miró, Kandinsky and Mondrian, as well as more exotic sources like Tantric art, add historical resonance, but not to stuffy or cleverly retro effect.
The architect and designer Owen Jones enunciated its guiding principles in the 1856 book "The Grammar of Ornament," which introduced tropes from Moorish, Persian and Egyptian art, among other exotic sources.
Concern about greenhouse gases and reliance on imported oil usually leads to a focus on the supply side of the energy equation, particularly exotic sources such as wind, solar, waves and hydrogen.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com