
Long the science where math mattered less, biology increasingly demands powerful quantitative skills. Teaching students the math they need, though, is more than just 1 + 1=2. Read about how real-world math problems may make students better biologists. Also in this issue:
- Children with the subtlest form of autism suffer social isolation; those with more severe disease face a much tougher road;
- Animals have evolved intricate ways to ensure that gene activity is the same in males and females despite the inherited imbalance of X chromosomes;
- As scientists learn more about how to produce and manipulate stem cells, amid high expectations and close scrutiny, no one is ready to choose any one approach over the other.





