BMJ 1995; 310 doi: https://doi.org/10.1136/bmj.310.6994.1616 (Published 17 June 1995) Cite this as: BMJ 1995;310:1616

Research into biological diversity in the human genome (Science 1995;268:1141-2) has shown that evidence from mitochondrial DNA and from the Y chromosome is consistent in showing that modern man came from Africa around 200000 to 300000 years ago. Our modern ancestor must have spread throughout the world in that comparatively short time.

Roller blading, or in line skating, has replaced skate boarding as the fashionable urban exercise in streets and parks and has the same potential for injury to participants and random pedestrians. According to the “Canadian Journal of Public Health” (1995;86:133-6), over 30000 people are injured each year in North America. The message is the familiar one—wear protective clothing and learn the basic skills, for novices generally find it easier to keep going than to stop.

Around 60% of the two million residents of nursing homes in the United States suffer from incontinence. Managed care aims at avoiding unnecessary treatments, so the managers will be delighted to read (Annals of Internal Medicine 1995;122:749-54) of a study in California confirming the belief that treating asymptomatic bacteriuria has no observable effect on the severity of incontinence. …

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