There were 93,688,000 Americans not participating in the labor force in February, a decline of 374,000 individuals from the previous month, according to data from the Bureau of Labor Statistics released Friday.

Overall, the labor force participation rate for all Americans improved from 62.7 percent to 62.9 percent in February and the unemployment rate remained unchanged at 4.9 percent in February.

This measure does not account for those individuals who have dropped out of the labor force. The unemployment rate simply measures the percent of those who did not have a job but actively sought one over the month.

The "real" unemployment rate, otherwise known as the U-6 measure, was 9.7 percent, which declined from 9.9 percent in January. Some Democrats such as Sen. Bernie Sanders (I., Vt.) and Federal ReserveFor most people, mere mention of the word Jurassic conjures up images of huge dinosaurs chomping their way through lush vegetation – and each other. However, mammals and their immediate ancestors were also around in the Jurassic period (201-145 million years ago), albeit as rather less spectacular creatures.

These shrew-sized, early Jurassic mammals were thought to have been confined to the ecological margins, eating whatever insects they could find. However, this was also the time when new mammal characteristics – such as better hearing and teeth capable of precise chewing – were developing. So, if the earliest mammals were all small generalized insectivores, where was the competition driving the evolution of such features?

To answer this question, the researchers studied fossils of these early mammals found in Glamorgan, South Wales