A droll doctor is Rollo Eugene Dyer, assistant director of the National Institute of Health. His favorite drollery last summer was to pull up his trouser leg and exhibit a small, fine-meshed cage ...

The scale bar indicates 500 microns, which is roughly five times the width of a human hair. Gregory Sutton and Malcolm Burrows via JEB Feb. 10, 2011, 2:49 PM EST / Source : LiveScience ...

Before fleas take off on a jump, their knees appear to rest on the ground, creating an important sticking point in the debate. With the aid of the cameras, the researchers filmed the fleas jumping ...

“There’s a tuft of artificial hair at the bottom and they like to cling to that,” says Hinnebusch. Then, the researchers ordered human blood to feed to the lice.

The human fleas and lice model most closely coincides with the mortality rates in seven of the nine European cities. Florence, in the year 1400, lost 10,215 people, London in 1563-64 lost 16,886 ...