Also in this issue:

Research stories

There will be blood stem cells
Human cells are muliplied 20-fold in culture, offering promise for bone-marrow transplants

Recipe for reprogramming
The science of induced pluripotent stem cells advances rapidly in mice

A night in the life of Whitehead
Behind the scenes one late evening at the Institute

Whitehead tales
How does a chopped flatworm decide where to grow a head or a tail?

Science and society

Peer review goes under the lens
How can we improve the filter in scientific publishing?

Passports to science
Postdocs from overseas reflect on lab life, careers and Cambridge culture

Fast FAQs: Running interference
What RNA interferencebrought to genetics -- and what's still on the wish list for tools

Window on Whitehead: Holidays in the lab
Whitehead's three-day high school student spring program