So he would say they do practice a stop-and-frisk type thing here.

NPR: Pick 'Em Up, Lock 'Em Up: Getting Tough On Gangs

The hopeful news Dr Bearman's work brings is that it should be easier to stop the spread of sexually transmitted diseases through a teenage-type graph than an adult one, since the spindly chains of connection between individuals can more easily be broken.

ECONOMIST: What maths tells us about us

We also found that the same program of comprehensive lifestyle changes can reverse type 2 diabetes and may slow, stop, or even reverse the progression of early-stage prostate cancer.

CNN: Change your lifestyle, reverse your diseases

The President will travel to Oslo on the 10th, and believed it was important to use this visit to help get us to the point of a deal -- something that can take the type of action that scientists say need to be taken to stop and reverse climate change.

WHITEHOUSE: Press Briefing