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2. Whiteboard - Wikipedia

   en.wikipedia.org/wiki/Whiteboard

   A combination between a whiteboard and a cork bulletin board Original early 1960s ad for "Plasti-slate", the first whiteboard/dry erase board invented by Martin Heit. It has been widely reported that Korean War veteran and photographer Martin Heit and Albert Stallion, an employee at Alliance, a leading flat rolled steel sheet supplier should be credited with the invention of the whiteboard in ...

3. Magic Slate - Wikipedia

   en.wikipedia.org/wiki/Magic_Slate

   The Magic Slate consists of a piece of rigid cardboard the size of a small clipboard that is covered with dark waxed paper on one side, a sheet of translucent plastic film that covers the waxed paper and is affixed to the top of the board, and a blunt stylus made of wood or plastic. When writing or drawing on the plastic film with the stylus ...

4. Calendar - Wikipedia

   en.wikipedia.org/wiki/Calendar

   In a solar calendar a year approximates Earth's tropical year (that is, the time it takes for a complete cycle of seasons), traditionally used to facilitate the planning of agricultural activities. In a lunar calendar, the month approximates the cycle of the moon phase. Consecutive days may be grouped into other periods such as the week.

5. Mesoamerican calendars - Wikipedia

   en.wikipedia.org/wiki/Mesoamerican_calendars

   The Maya version of the 260-day calendar is commonly known to scholars as the Tzolkin, or Tzolk'in in the revised orthography of the Academia de Lenguas Mayas de Guatemala. [23] The Tzolk'in is combined with the 365-day calendar (known as the Haab, or Haab' ), to form a synchronized cycle lasting for 52 Haabs, called the Calendar Round.

6. Nepal Sambat - Wikipedia

   en.wikipedia.org/wiki/Nepal_Sambat

   The calendar still holds cultural significance in Nepal, especially among the Newar people, whose festivals are based on this calendar system. [6] Owing to its cultural and historical significance, the government of Nepal declared to include Nepal Sambat in official government documents alongside Vikram Sambat since 11 November 2023.

7. History of books - Wikipedia

   en.wikipedia.org/wiki/History_of_books

   Since the Amazon Kindle was released in 2007, the e-book has become a digital phenomenon and many theorize that it will take over hardback and paper books in the future. E-books are much more accessible and easier to buy and it is also cheaper to purchase an E-Book rather than its physical counterpart due to paper expenses being deducted. [ 69 ]