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2. Pencil case - Wikipedia

   en.wikipedia.org/wiki/Pencil_case

   Some pencil cases have a hard and rigid shell encasing the pens inside, while others use a softer material such as plastic, leather or cotton. Soft versions are typically fastened with a zipper. Early pencil cases were round or cylindrical in shape. Some early pencil cases were decorated with jasper (one from 1860) or platinum (from 1874). [1]

3. Strength of glass - Wikipedia

   en.wikipedia.org/wiki/Strength_of_glass

   S-glass has a strength of 700,000 pounds per square inch (4,800 MPa) while E-glass and C-glass have a strength of 500,000 pounds per square inch (3,400 MPa). [ 9 ] Hardness

4. Mechanical pencil - Wikipedia

   en.wikipedia.org/wiki/Mechanical_pencil

   A mechanical pencil or clutch pencil is a pencil with a replaceable and mechanically extendable solid pigment core called a "lead" / ˈ l ɛ d /. The lead , often made of graphite , is not bonded to the outer casing, and the user can mechanically extend it as its point is worn away from use.

5. Pencil - Wikipedia

   en.wikipedia.org/wiki/Pencil

   On 3 September 2007, Ashrita Furman unveiled his giant US$20,000 pencil – 23 metres (76 ft) long, 8,200 kilograms (18,000 lb) with over 2,000 kilograms (4,500 lb) for the graphite centre – after three weeks of creation in August 2007 as a birthday gift for teacher Sri Chinmoy. It is longer than the 20-metre (65 ft) pencil outside the ...

6. 5D optical data storage - Wikipedia

   en.wikipedia.org/wiki/5D_optical_data_storage

   5D optical data storage (also branded as Superman memory crystal, [1] a reference to the Kryptonian memory crystals from the Superman franchise) is an experimental nanostructured glass for permanently recording digital data using a femtosecond laser writing process. [2]

7. Briefcase - Wikipedia

   en.wikipedia.org/wiki/Briefcase

   An attaché case (or sometimes called diplomat case) is a box-style case characteristically made of leather fitted over an internal hinged frame that opens into two compartments. It was traditionally carried by an attaché , a diplomatic officer attached to an embassy or consulate officially assigned to serve in a particular capacity (e.g ...