Americans are spending more and more time inside. The Mayo Clinic is partnering with real estate company Delos to study how all of that time indoors affects our health. The study takes place in a specially crafted lab. The rooms are built to look as normal as possible, but they contain monitors that track the activity inside the space. The participants will live in the lab like it’s a hotel. Since Americans spend about 90 percent of their time indoors, the findings could be important in improving quality of life. The findings also could impact how companies build their workspaces.