Reuters Science News Summary

Following is a summary of current science news briefs. Blimps to bolster Washington's air shield in test WASHINGTON (Reuters) - A pair of big, blimp-like craft,moored to the ground and flying as high as 10,000 feet, are tobe added to a high-tech shield designed to protect theWashington D.C. area from air attack, at least for a while. Thebulbous, helium-filled "aerostats" - each more than