Both use vast particle accelerators to speed up electrons, which spray out X-rays as they pass around the accelerators.

BBC: Van Gogh's Flowers In A Blue Vase damage seen in X-rays

Blazars are a special case of "active galaxies" - those whose supermassive black holes spray out great quantities of light across the whole electromagnetic spectrum as they feed on surrounding matter.

BBC: Blazar Markarian 421's flare-up is cosmic coincidence

In the world of agriculture, as with popular medicine, the theory is to treat the symptom (in this case insect invasions) and to hope that by the time fix becomes ineffective we have something else figured out to spray, engineer or swallow to re-bandaid the problem.

FORBES: Genetic Engineering: A Food Fix?

What you get for your money is a brace of decent shocks, a spray of special effects (look out for the upward-raining bathwater), and almost no sense of dread.

NEWYORKER: The Ring Two

Four out of five American households have at least one blue-and-yellow spray can for loosening the stubborn elbow joint under the kitchen sink or silencing the squeaky screen door.

FORBES: Johnny One-note

Four out of five American households have at least one blue-and-yellow spray can for lubricating the stubborn elbow joint under the kitchen sink or silencing the squeaky screen door.

FORBES: Greasy Coca-Cola

Engineers can calculate the most efficient route for a spray-painting robot to take around a car body, work out how quickly parts must be supplied, look for bottlenecks or even tell if a human worker's task is likely to give him backache.

ECONOMIST: Manufacturing technology

But no matter how much energy you put into building a sandcastle, it's unlikely to be as impressive as the structures produced by Stone Spray, a solar-powered, robotic 3D printer that can create entire buildings out of sand.

ENGADGET: Inhabitat's Week in Green: Eindhoven's Evoluon Center, folding compact cars and the best of 3D printing