sentence: People use whiteboards instead.
sentences_before: Blackboards are often used to help teach in school. Blackboards are not used as much now.
sentences_after: Whiteboards are used because some people are allergic to the dust the chalk used to write on chalkboards generate, and because the dust is hard to clean up when spilled.
concept_name: People
headings: Blackboard
categories: Learning Writing media