News
- Plants
Leonardo da Vinci’s rule for how trees branch was close, but wrong
An update to da Vinci’s elegant, 500-year-old “rule of trees” offers a powerful, new way to describe the structure of almost any leafy tree.
- Health & Medicine
Antibiotics diminish babies’ immune response to key vaccines
With each round of antibiotics during a child’s first two years, antibody levels to four vaccines dropped further from what’s considered protective.
- Space
All of the bases in DNA and RNA have now been found in meteorites
Scientists have detected adenine and guanine in meteorites for decades and seen hints of uracil. But cytosine and thymine had remained elusive.
