No one knows why Hypospadias, a birth defect where the urethral opening is abnormally placed, became more common among Swedish boys in recent decades. Before 1990, it happened in 4.5 per 1,000 boys, and after that increased to 8 per 1,000 boys.

Researchers looked at past attributed causes (in epidemiology, they find two curves that go the same direction and attribute causation), such as low-birth weight, being born a twin, or being born from in vitro fertilization (IVF) to conceive, but the curves did not match.

Maybe it was less reported in 1973. No one can say. So they created a new cause out of thin air: endocrine disruptors.

20 years ago, nuclear science died a horrible death at the hands of President Clinton and Senator John Kerry. It's science fiction fantasy to imagine now what nuclear science would be like if the last 40 years had been spent with American ingenuity and technological prowess tackling the issue, rather than it becoming a political football to placate anti-science activists before finally being killed off.

Its legacy haunts us today. With nuclear energy blockaded well before that, and modern hydraulic fracturing not yet created, America had to rely more on coal. Environmental groups never accept any blame for the U.S. rise in CO2 emissions, but it rests squarely on them as much as it does on automobiles. 

Cancer is the blanket term for over a hundred diseases where abnormal cells divide and invade tissues through blood and lymph systems. The extra cells are often detected in the form of a tumor that people notice as their first symptom, and those can be benign or malignant.

The 21st century will be the century of the 'smart home', where your home and your portable technology all interact seamlessly with one another.