Whiteboard
Whiteboards became commercially available in the early 1960s, but did not become widely used until 30 years later. Early whiteboards needed to be wiped with a damp cloth and markers had a tendency to leave marks behind, even after erasing the board. Dry-erase markers for whiteboards were invented in 1975.
Sideboard
The earliest versions of the sideboard familiar today made their appearance in the 18th century, but they gained most of their popularity during the 19th century as households became prosperous enough to dedicate a room solely to dining. Sideboards were made in a range of decorative styles and were frequently ornamented with costly veneers and inlays. In later years, sideboards have been placed in living rooms or other areas where household items might be displayed.