He built up the pigment into a thick mask of impasto, fusing the colors by blotting the paint with sheets of newspaper.

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The WDCS says the frequency ranges of some noise sources of human origin may be blotting out other, biologically important sounds, preventing mothers and calves from staying in touch and masking sound cues for predators and their prey.

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"It's like blotting paper, " he says.

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