Blackboard (or chalkboard) is an important instructional material and ubiquitous in almost all learning institutions from the 19th century up to this century. The first chalkboards are made of black slates, partner with white chalk for writing. The tandem turned out to be favorable to most because of their contrasting colors, it is very easy to see writings made by white chalk on the black-colored chalkboard.
The legal pad, popularly known in the Philippines as "yellow pad", was said to be invented in 1888 by Thomas W. Holley. Thomas worked at a paper mill in Holyoke, Massachusetts, USA. The paper mill produces lots of paper scraps resulting from cutting paper into the right size. To earn extra income, he used these paper scraps to produce cheap papers which he can sell.
Corned beef is a salt-cured beef product. Its exact date of origin remains unknown but most likely came about when people began preserving meat through salt-curing. It was popular during both World War 1 and World War 2 as fresh meat was not always available in battlefields.
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