From Charles de Gaulle Airport and from Gare du Nord take the RER B in direction Saint-Remy les Chevreuses and get off at the station Gif-sur-Yvette. The ride takes about 75 minutes from the airport, and 45 minutes from the railroad station. Beware that only one RER out of three goes that far. For this, check at the station where you enter the RER one of the boards: there is a small light in front of the names of the stations where the next train stops.
From Orly Airport, take the Orlyval until the station Antony of the RER B, and then follow the previous indications. The ride takes about 30 minutes.
Leave the station Gif-sur-Yvette at the exit centre ville. Go straight and pass by the church (04) at the crossing. Continue your way which turns slightly to the left until the next crossing. Turn there to the right, the main entry of the CNRS is in front of you (I).
The participants are lodged in the Centre the Formation (31), and the talks will take place in the Chateau (03).
To go to the Centre de Formation (31), take the pedestrian road at the level of the main entry (I) which follows the river and leads directly to the building (31). Another possibility is to follow the main road until the crossing (22), then to turn left and to continue straight to the building (31).
To go to the Chateau (03), cross the main entry (I) and
take the first street to your right.. At the next crossing (108) turn again
to the right and continue your way until you reach the Chateau.