Second Nature is a consumer goods company founded in 2012 and based in North Carolina, United States. They specialize in providing air filters through a web-based platform, offering services such as shipping, installation, and maintenance to help improve indoor air quality and protect HVAC systems.

Substack is a platform that empowers writers to create and monetize email newsletters with user-friendly publishing tools and subscription management solutions, fostering a seamless reading experience for both publishers and readers.