Adjective. not lasting, enduring, or permanent; lasting only a short time; existing briefly. Philosophy. person or thing that is transient, especially a temporary guest, boarder, laborer, or the like. Electricity. a sudden pulse of voltage or current

Fidget spinners work because there is a bearing in the centre. This is a good example of conservation of angular momentum, essentially the thing will keep spinning until there is an external moment, this is provided by the friction between the two rings. Ball bearings in between the two rings mean that as small as possible surface is touching between the two rotating rings, meaning friction is as low as possible. Skateboards, rollerblades, bikes and cars are all designed to waste as little as possible energy as heat and sound during friction between the axle and the wheel.

A fun, engaging and interactive program that introduces kids to the fascinating world of civil engineering through experimenting with various building materials and the effect of forces and loads on buildings they design themselves. Kids are exposed to various types of bridges and why they are essential. Kids design and build their own bridges, considering forces, loads, durability, and budget.

A comprehensive article on the perceptions of the aptitude of male versus female scientists, both by their male and female coworkers and a description of the continuous bias against women in sciences.

Short video on how vaccines work and how they protect mankind!

The visible absorption and photoluminescence of CdSe nanoparticles depend on the size of the particle. A sudden injection of room temperature selenium solution into hot cadmium solution produces quickly-growing seed crystals. Samples are withdrawn from the hot solution and quenched at room temperature to produce a series of increasing particle sizes and observable change in color.

Understanding how an acid-base indicator works in real life situations and how to make one at home. 

This video, from the Portuguese Engineers Association, presents Chemical and Biological Engineering and generally describes the profession of an Chemical and Biological Engineer and his present contribution to social and economic development

This video, from the Portuguese Engineers Association, presents Mechanical Engineering and generally describes the profession of an Mechanical Engineer and his present contribution to social and economic development