D Jumping worms are wriggling(蠕动) their way across the United States, greedily swallowing protective forest leaf litter and leaving behind bare soil. They replace other earthworms, insects and ground-nesting birds, and disrupt forest food chains. They can harm more than 12 acres in a single ...
Some biologists reckon the forest ones-smaller, with shorter, straighter tusks-may even constitute a distinct species. But not for long, at the latest rate of poaching. The high price of ivory is increasing the incentive to kill elephants everywhere in Africa, and especially in places where ...
However, the nematic phase formed by the worms is filled with tiny regions where the local alignment is lost - defects in the otherwise aligned material. In addition, because the worms are constantly moving and changing their configuration, thisnematic phaseis active and far from equilibrium. In ...