old_contents: var map = L.map('map').setView([52.2100, 0.1300], 13);
  
  L.tileLayer('http://{s}.tile.cloudmade.com/' + API_KEY + '/997/256/{z}/{x}/{y}.png', {
      attribution: 'Map data &copy; <a href="http://openstreetmap.org">OpenStreetMap</a> contributors, <a href="http://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>, Imagery © <a href="http://cloudmade.com">CloudMade</a>',
      maxZoom: 18
  }).addTo(map);
  
  map.doubleClickZoom.disable();
  
  var circle = L.circle([52.2100, 0.1300], 500, {
      color: 'red',
      fillColor: '#f03',
      fillOpacity: 0.5
  }).addTo(map);
  
  var data = [42.3964, 71.1223];
  
  var svg = d3.select(map.getPanes().overlayPane).append("svg"),
      g = svg.append("g").attr("class", "leaflet-zoom"); 
  
  svg.selectAll("circles") 
      .data(data)
  .enter().append("circle")
      .attr('class', 'geoChatCircle')
      .attr("cx", 12)
      .attr("cy", 12)
      .attr("r", 6)
      .style("fill", "#ccc")
      .style("stroke", "red")
      .style("stroke-opacity", 1)
      .style("stroke-width", 3);
  
  function project(x) {
    var point = map.latLngToLayerPoint(new L.LatLng(x[1], x[0]));
    return [point.x, point.y];
  }
  
new_contents: var map = L.map('map').setView([42.375, -71.106], 13);
  
  L.tileLayer('http://{s}.tile.cloudmade.com/' + API_KEY + '/997/256/{z}/{x}/{y}.png', {
      attribution: 'Map data &copy; <a href="http://openstreetmap.org">OpenStreetMap</a> contributors, <a href="http://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>, Imagery © <a href="http://cloudmade.com">CloudMade</a>',
      maxZoom: 18
  }).addTo(map);
  
  map.doubleClickZoom.disable();
  
  var circle = L.circle([52.2100, 0.1300], 500, {
      color: 'red',
      fillColor: '#f03',
      fillOpacity: 0.5
  }).addTo(map);
  
  var data = [42.373939, -71.119106];
  
  var svg = d3.select(map.getPanes().overlayPane).append("svg"),
      g = svg.append("g").attr("class", "leaflet-zoom"); 
  
  svg.selectAll("circles") 
      .data(data)
  .enter().append("circle")
      .attr('class', 'geoChatCircle')
      .attr("cx", 12)
      .attr("cy", 12)
      .attr("r", 6)
      .style("fill", "#ccc")
      .style("stroke", "red")
      .style("stroke-opacity", 1)
      .style("stroke-width", 3);
  
  function project(x) {
    var point = map.latLngToLayerPoint(new L.LatLng(x[1], x[0]));
    return [point.x, point.y];
  }
  
  
subject: add lat&long for cambridge, ma