Latest Millennium Development Goals Stories
The destruction of atmospheric ozone can take place within newly forming Polar Stratospheric Clouds (PSCs), which serve as the battleground for manmade chlorofluorocarbons (CFCs) to attack and destroy ozone.
Researchers from Harvard, led by Weld professor of atmospheric chemistry James G. Anderson, have discovered a serious and wholly unexpected ozone loss over the United States in summer.
Insufficient progress has been made in most developing countries to meet the United Nations' target of halving the proportion of children who suffer from hunger by 2015 compared with 1990 levels.
Human immunodeficiency virus (HIV), a lentivirus, causes acquired immunodeficiency syndrome (AIDS) which is a condition in humans were the immune system begins to fail, leading to life-threatening opportunistic infections. Infection is transferred through bodily fluids where HIV is present as both free virus particles and within infected immune cells. The four most common routes of infection are unsafe sex, contaminated needles, breast milk, and transmission from an infected mother to her...
- A pivoted catch designed to fall into a notch on a ratchet wheel so as to allow movement in only one direction (e.g. on a windlass or in a clock mechanism), or alternatively to move the wheel in one direction.