Monday 06 January 1997
The Jewish priesthood, the Cohanim, are among the true children of Israel, having genetic distinctions that seem to date back to "a unique evolutionary event" - a DNA insert - 29,000 to 340,000 years ago. Biblical accounts say the Cohanim (separate from rabbis) were established3,300 years ago when the first Israelite high priest was appointed. Membership is passed to male children of priests on their Y chromosome. Genetic testing found only 1.5 per cent of Cohanim had the DNA insert, compared with 18.4 per cent of lay Jews, even among those living as far apart as Israel, the US and UK.
Why is it that obese girls tend to enter puberty earlier than average, and lean female ballet dancers much later? A team from the University of California at San Francisco reckons the answer is the hormone leptin, secreted by fat tissue. They injected leptin into pre-pubertal female mice, and found that they began reproducing before a control group. Conclusion: "that leptin acts as a signal triggering puberty", say the authors in last week's Science, "supporting the hypothesis that fat accumulation enhances maturation of the reproductive tract". So if you want to grow up, put on some weight.
If life existed here 3,800 million years ago, as research in Greenland rocks suggests, Heinrich Holland at Harvard University says that either the destructive effects of meteorite impacts had decreased dramatically before then, or life was invented more than once, or our distant ancestors were truly hardy. Writing in Science, he prefers the first - reckoning that geological evidence points to a planet that had already settled down to its present, "somewhat humdrum existence", offering the relatively stable conditions required to support life.
Happy birthday this year to complex numbers (devised in 1797), the sewing machine and modern flute (1847), the discovery of the mountains of the Moon (1647), of tobacco (1497, by a monk who sailed with Christopher Columbus), and of the electron (1897) by Joseph John Thomson at the Cavendish Laboratory in Cambridge. Expect celebrations of the latter centenary around March.
- 1 President of Argentina adopts Jewish godson to 'stop him turning into a werewolf'
- 2 Doctors remove 80 teeth from boy's jaw
- 3 The 'Black Museum': After 150 years, public set to see exhibits from police’s grisly crime museum
- 5 Sir Winston Churchill’s family begged him not to convert to Islam, letter reveals
President of Argentina adopts Jewish godson to 'stop him turning into a werewolf'
The 'Black Museum': After 150 years, public set to see exhibits from police’s grisly crime museum
Downfall of Dustin 'Screech' Diamond, the 'Saved By The Bell' star charged with bar stabbing
Syrian teenager Usaid Barho reveals how he escaped from Isis using a suicide vest
Sir Winston Churchill’s family begged him not to convert to Islam, letter reveals
Millions of Britons struggling to feed themselves and facing malnourishment
British actor Idris Elba cannot star as James Bond because he is black, says shock jock Rush Limbaugh
Ukip member gets into Christmas spirit with Union Flag plea to Santa 'for our country back'
Germany anti-Islam protests: 17,000 march on Dresden against 'Islamification of the West'
Nigel Farage: Ukip leader named 'Briton of the year' by The Times
Immigrants make UK racist, says Ukip councillor Trevor Shonk
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