CRC 900 is extended by the DFG (Deutschen Forschungsgemeinschaft) in the third funding period! The new funding period runs for 4 years until the middle of 2022. Thus, the CRC 900 has reached the maximum funding period of 12 years for Collaborative Research Centers. We celebrate this great success and start the new funding period with a new project (B11) and an extended consortium of participating scientists!