Our houses still have a lot of room for immediate improvements. For example having a flushing toilet in the same room where you wash your hands and shower yourself is probably not an optimal design. I&#x27;ve seen a few studies measuring bacterial communities that came into this conclusion. Not to diminish the importance of toilets, though. They are a fantastic Victorian innovation.<p>You also want to control air currents so that mold doesn&#x27;t go to other rooms, but few designs account for this.<p>Many materials off-gas harmful chemicals. Formaldehyde, often in some glues, is one example. I see a lot of room for measuring and ensuring homes are healthy. Perhaps a big task for IoT.