Six separate signing glossaries, delivered as apps for use with handhelds, are now available free from the App Store. They can be used with iPhones, iPads, and iPods and are designed to provide visitors who are deaf or hard of hearing  access to STEM vocabulary during visits to to aquariums, botanical gardens, natural history museums, nature centers, science museums, and zoos. For more information, go to https://signsci.terc.edu/glossary/index.html.