The scientists wanted to make greenhouses in sunny areas receive more sunlight to reduce heating costs in cooler months. They designed special greenhouses with slanted roofs to let in more winter sun. By comparing these new designs to standard ones, they found that the new greenhouses got about 7-8% more sunlight, which can help save energy in heating. These improved designs could make it easier to grow crops in colder regions, extending growing seasons and making farming more efficient.