Payloads: Combustion Integrated Rack (CIR):  The CIR Manifold #4 Bottle was swapped out with a bottle containing 100% C2H4.  The CIR includes an optics bench, combustion chamber, fuel and oxidizer control, and five different cameras for performing combustion investigations in microgravity. Concrete Hardening:  The Maintenance Work Area (MWA) was cleared in preparation of the Concrete …

Source: ISS Daily Summary Report - 1/31/2021