US firms drawing a line on after-hours email

Katey Klippel makes a point of keeping her smartphone in her bag when she returns home from a hard day at the management consulting firm where she works in Washington.

Interstellar dust and the sun

(Phys.org)—The space between stars is not empty. It contains copious but diffuse amounts of gas and dust; in fact about 5-10% of the total mass of our Milky Way galaxy is in interstellar gas. About 1% of the mass of this ...

MicroRNAs in plants: Regulation of the regulator

MicroRNAs are essential regulators of the genetic program in multicellular organisms. Because of their potent effects, the production of these small regulators has itself to be tightly controlled. That is the key finding ...

Study shows that organic aerosols aging caused by OH radicals

Atmospheric aerosol particles have a significant effect on climate. An international team of researchers has now discovered that a chemical process in the atmosphere called aging determines to a major extent the concentration ...

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