Parasites are one such problem you may encounter ... Head lice are the most common, and they can be found worldwide in human hair, eyebrows, and eyelashes. They tend to not cause any diseases ...

Lice are tiny wingless insects that feed on human blood from the scalp. From wet combing to petroleum jelly, check out the ...

Another parasitic worm, Clavinema mariae, which doesn't cause illness in humans, increased its numbers eight times in local English sole since the 1930s. Wood says that normal public-health ...