Nuclear spins are usually not thought to participate in chemical reactions. However, in the ultracold temperature regime, we have a new opportunity to examine this general statement with quantum mechanical details. In this talk, I will present our ongoing investigations into the roles of nuclear spins, quantum coherence, and entanglement in atom-molecule and molecule-molecule reactions, as well as sticky collisions, utilizing a one-of-a-kind ultracold KRb molecule apparatus. There will be surprises and puzzles.
