The Windows to the Universe website is maintained by the National Earth Science Teachers Association, and it has been around since the mid-1990s. One particularly interesting area of the site focuses in on the world of biomes and ecosystems. For those who might be unacquainted with such matters, biomes are large regions of the world with similar plants, animals, and other living things that are adapted to the region's climate and conditions. Visitors can use the interactive map to explore these various biomes, and learn about the natural history and current conditions in the dry steppes, Alpine tundra, and a dozen other biomes. Each section contains photographs and a narrative essay that describes in summary detail the key features of each biome.