It looked like just another dull piece of basalt, so much of which litters the Martian surface.

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Industrial waste, much of it toxic, litters the landscape, poisoning the soil, water and air.

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"Hedgehogs are having second litters because of the warmer autumns, " she explained.

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Pets die, dog excrement litters the kitchen floor, and David recedes into his office, emerging only to grumble about the electric bill.

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Of 47 litters of cubs, 43% contained cubs from multiple fathers.

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"Lo and behold, two children came in on litters" Williamson says.

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The transgene began to be expressed again in the resulting litters.

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Damage litters the terrain, and it isn't confined to tech.

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Females start breeding at four months old and give birth to litters of a half-dozen offspring about four times per year, he said, meaning any poison has to outpace reproduction.

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But for all the gains, the departure of the old days still litters the path forward with a surprising amount of debris that take away the comfortable fit that progress assumed.

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Debris litters the corridors.

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