□
□ □
[□]
Here the scientists not only grow embittered by their inability to understand the ecology of Shiva , but become jaded by the existential horror of confronting an alien race that may be as vastly superior to us as we are to amoebas . This herbicide shows promise because it is even more specific than triclopyr in the plant families it affects ; specifically , this herbicide kills leguminous species but does not affect grasses and most other plant families . This is the nature of the magazine market , ever an intermingler of gems and dross ; but Asimov 's is cheap , the dross is easily ignored , and August 's gem is one of rare lustre indeed ... Clopyralid is a relatively selective post-emergence herbicide that kills certain broadleaf weeds and woody plants but does little harm to others such as members of the mustard family ( Brassicaceae ) or to grasses and other monocots . NASA managers late Wednesday ruled out an attempt to launch the shuttle Atlantis Thursday but held open the possibility of a last-ditch Friday launching if engineers can resolve a problem with one of the ship 's three electrical generators before time runs out . Mowing temporarily reduces above-ground biomass , but does not kill Cirsium arvense unless repeated at 7-28 day intervals for up to 4 years . Public because just as a healthy democracy is one where everyone not only has the right to vote but does so , the cultural life of a country is similarly enriched through the sustained access and participation of the people . Cutting or mowing C. varia at a frequency of less than once per year is not effective at controlling populations , but does offer a method for temporarily stopping or slowing its spread . The same people aver that Congress meant that the government in the Philippines should not only be " stable " while the American flag flew there , but be capable of maintaining this stability after the United States had withdrawn from the Islands .