Search results
Results from the WOW.Com Content Network
It is usually mixed with oil, sometimes water, and rubbed on the surface of varnished or lacquered wood with a felt pad or cloth. Rotten stone is sometimes used to buff stains out of wood. Some polishing waxes contain powdered rotten stone in a paste substrate. For larger polishing jobs, rotten stone mixed with a binder is applied to polishing ...
Rock paintings in Libya. Because drawing preceded writing, the first remains of writing materials are the stone walls of the caves on which cave paintings were drawn. Another precursor was tally sticks used to record the count of objects or the passage of days or other discrete units of time. Tally sticks have been found made of wood and bone.
The name is derived from the Nahuatl language and means "hand-wood". [2] Its sides are embedded with prismatic blades traditionally made from obsidian, which is capable of producing an edge sharper than high quality steel razor blades. The macuahuitl was a standard close combat weapon.
A material made of black holes; can be used to warp space and time in accordance with the wishes of its inventor. [35] Corrodium Ben 10: A mutagenic crystal from the Anur System. Dagal Skylark: A synthetic metal made by the Urvanians. Superior to the Arenak made by their enemies, the Osnomians. [17] Dalekanium: Doctor Who
[19] [20] [21] While this has been shown to work, archaeologists have yet to discover an actual spoon made of magnetite in a Han tomb. [ 22 ] Based on his discovery of an Olmec artifact (a shaped and grooved magnetic bar) in North America, astronomer John Carlson suggests that lodestone may have been used by the Olmec more than a thousand years ...
The log structure was made at least 476,000 years ago, while the wood tools are slightly younger, under 400,000 years old. That places the materials in a time before our species, Homo sapiens ...
This human-made material, when scraped with any hard, sharp edge, produces sparks that are much hotter than obtained with natural flint and steel, allowing use of a wider range of tinders. Because it can produce sparks when wet and can start fires when used correctly, ferrocerium is commonly included in survival kits .
Rock cupules (/ ˈ k j uː p j uː l /) are artificially made depressions on rock surfaces that resemble the shape of an inverse spherical cap or dome. [1] They were made by direct percussion with hand-held hammer-stones, on vertical, sloping or horizontal rock surfaces.