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2. Tracing paper - Wikipedia

   en.wikipedia.org/wiki/Tracing_paper

   Tracing paper is paper made to have low opacity, allowing light to pass through. Its origins date back to at least the 1300s where it was used by artists of the Italian Renaissance. [1] In the 1880s, tracing paper was produced en masse, used by architects, design engineers, and artists. [2] Tracing paper was key in creating drawings that could ...

3. Zaner-Bloser (teaching script) - Wikipedia

   en.wikipedia.org/wiki/Zaner-Bloser_(teaching_script)

   The Zaner-Bloser (also Zaner-Bloser Method) is a teaching script for handwriting based on Latin script as well as a system of penmanship instruction, which originated around 1904 at the Zanerian College of Penmanship in Columbus, Ohio. Charles P. Zaner (1864–1918) and Elmer W. Bloser (1865–1929), originally a Spencerian Method instructor ...

4. Locard's exchange principle - Wikipedia

   en.wikipedia.org/wiki/Locard's_exchange_principle

   The case studies below show how prevalent Locard's Exchange Principle is in each and every crime. [citation needed] The examples using Locard's Principle show not only how the transfer of trace evidence can tell the tale of what happened, [citation needed] [dubious – discuss] but also how much care is required when collecting and evaluating trace evidence.

5. Form 4473 - Wikipedia

   en.wikipedia.org/wiki/Form_4473

   Form 4473. A Firearms Transaction Record, or ATF Form 4473, is a seven-page form prescribed by the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) required to be completed when a person proposes to purchase a firearm from a Federal Firearms License (FFL) holder, such as a gun dealer. [1]

6. Printed circuit board - Wikipedia

   en.wikipedia.org/wiki/Printed_circuit_board

   Printed circuit board of a DVD player. Part of a 1984 Sinclair ZX Spectrum computer board, a printed circuit board, showing the conductive traces, the through-hole paths to the other surface, and some electronic components mounted using through-hole mounting. A printed circuit board (PCB), also called printed wiring board (PWB), is a medium ...

7. Phosphorus - Wikipedia

   en.wikipedia.org/wiki/Phosphorus

   Phosphorus is a chemical element; it has symbol P and atomic number 15. Elemental phosphorus exists in two major forms, white phosphorus and red phosphorus, but because it is highly reactive, phosphorus is never found as a free element on Earth. It has a concentration in the Earth's crust of about one gram per kilogram (compare copper at about ...