Richard Drew / AP
"Sperm count falling sharply in developed world" per Reuters: "Sperm counts in men from America, Europe, Australia and New Zealand have dropped by more than 50 percent in less than 40 years ... [Researchers] said the rate of decline is not slowing. Both findings ... pointed to a potential decline in male health and fertility. ... 'This study is an urgent wake-up call for researchers and health authorities around the world.'"
- Why it matters: "[R]esearchers said falling sperm counts have... been linked to various factors such as exposure to certain chemicals and pesticides, smoking, stress and obesity."