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2. Sandpaper - Wikipedia

   en.wikipedia.org/wiki/Sandpaper

   Sheets of sandpaper with different grit sizes (40 (coarse), 80, 150, 240, 600 (fine)) Sandpaper, also known as glasspaper or as coated abrasive, is a type of material that consists of sheets of paper or cloth with an abrasive substance glued to one face. [1]

3. Contact mechanics - Wikipedia

   en.wikipedia.org/wiki/Contact_mechanics

   Normal contact mechanics or frictionless contact mechanics focuses on normal stresses caused by applied normal forces and by the adhesion present on surfaces in close contact, even if they are clean and dry. Frictional contact mechanics emphasizes the effect of friction forces. Contact mechanics is part of mechanical engineering.

4. Frog - Wikipedia

   en.wikipedia.org/wiki/Frog

   These toe pads, moistened by the mucus, provide the grip on any wet or dry surface, including glass. The forces involved include boundary friction of the toe pad epidermis on the surface and also surface tension and viscosity . [ 124 ]

5. Timeline of historic inventions - Wikipedia

   en.wikipedia.org/wiki/Timeline_of_historic...

   1.5 Mya: Bone tools in Africa by Homo erectus [10] 900 kya – 40 kya: Boats [11] [12] 500 kya: Hafting in South Africa by Homo heidelbergensis [13] 500 kya – 450 kya: Woodworking construction in Zambia by Homo heidelbergensis [14] (The oldest known surviving buildings are made from stone and date back no more than 9,500 years. [15])

6. B - Wikipedia

   en.wikipedia.org/wiki/B

   B or b is the second letter of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide.Its name in English is bee (pronounced / ˈ b iː /), plural bees.

7. International Space Station - Wikipedia

   en.wikipedia.org/wiki/International_Space_Station

   This is an accepted version of this page This is the latest accepted revision, reviewed on 28 December 2024. Inhabited space station in low Earth orbit (1998–present) "ISS" redirects here. For other uses, see ISS (disambiguation). International Space Station (ISS) Oblique underside view in November 2021 International Space Station programme emblem with flags of the original signatory states ...