Chemistry

Chemistry is the science of matter at the atomic to molecular scale, production mainly with collections of atoms, such as gases, molecules, crystals, and metals. Chemistry deals with the composition and statistical properties of such structures, as well as their transformations and interactions to become materials encountered in daily life. Chemistry also deals with sympathetic the properties and interactions of individual atoms with the purpose of applying that knowledge at the macroscopic level. According to contemporary chemistry, the physical properties of materials are usually determined by their structure at the atomic scale, which is itself defined by interatomic forces.

Travois

A travois (Canadian French, from French travail, a frame for restrictive horses; also obsolete travois) is a border used by Native Americans, notably the Plains Indians of North America, to drag loads over land. The basic structure consists of a platform or netting mounted on two long poles, lashed in the shape of an extended isosceles triangle; the frame was dragged with the sharply pointed end ahead. Sometimes the blunt end of the frame was stabilizing by a third pole bound crossways the two main poles.
The travois was dragged by hand, now and then fitted with a shoulder harness for more capable dragging, or dragged by dogs or horses (although horses did not exist in North America before introduce by the Spanish in the 1520s). A travois could either be loaded by support goods atop the bare frame and tieing them in place or by first stretch cloth or leather over the frame to hold the load to be dragged.
Although measured more primitive than wheel-based forms of transport, on the type of country where the travois was used (forest floors, soft soil, snow, etc.), rather than roadways, wheels would encounter difficulties which make them a less well-organized option. As such they found use in New France's fur trade by Couriers des bois, who traded notably with the Native Americans.