Solar System older than previously thought : Nature News

Solar System older than previously thought : Nature News:

"A meteorite found in the Sahara Desert has helped to pin down the age of the Solar System and shed light on how it may have formed.

The new estimate, which comes from measuring the ratios of lead isotopes inside the chondrite — an ancient stony meteorite — suggests that the Solar System is 4.568 billion years old. This is 0.3–1.9 million years older than some previous studies projected. The relatively small revision means that models of the gas and dust that gave rise to the Solar System should have around double the amount of a certain iron isotope, iron-60, than previously suggested."

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Study: Girls Entering Puberty Earlier

Study: Girls Entering Puberty Earlier:

The age of puberty is declining for girls, with more girls developing breasts by age 7 than in years past, according to a new study.

Ethnicity plays a role in earlier puberty, says researcher Frank M. Biro, MD, director of the division of adolescent medicine at Cincinnati Children's Hospital Medical Center, Cincinnati. So does body composition.

'We found that girls who are African-American matured before whites, and that's been shown in several studies,' Biro tells WebMD. 'White girls are maturing earlier than they had before, compared to 20 years earlier.'

In his study of 1,239 girls, 10% of whites, 23% of African-Americans, and 15% of Hispanic girls had breast development indicating onset of puberty by age 7, Biro found.

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