London's air is a crisp, cold air today, but the movement of the city keeps me warm. The pressure on my barometer reads over 120 hPa, and the arrow of change points to 'clear' weather. I spend the day in rooms full of students in colleagues, on multiple tube and overground trains, and on busy high streets. Walking from my university campus in Bloomsbury to Tottenham Court Road at sunset, I can almost feel the warm glow of each body as it passes by me in the crowd.