Would you like to sit on the floor?

Article Abstract:

Research indicates that the traditional learning environment, in which students are expected to remain still and quiet for much of the time, merely listening to the teacher, does not necessarily suit some students. Some people learn better if they are sitting on the floor or in a soft chair, while others learn better if they can listen to music or eat while they work. Others are not really affected by their working environment at all. It is now time to investigate how the learning environment can be made more flexible, as this can be done relatively inexpensively.

United States, Science & research, Students & Teachers, Analysis, Work environment, Academic achievement

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Sails of the next century

Article Abstract:

There is currently renewed interest in the possibility of using the motive power of the sun's light to propel spacecraft. Research has already shown that a solar sail 3.6 km in diameter, trailing a one-tonne probe, could be powered by a 65 billion-watt laser fired from Earth orbit. It is possible that such energies may be developed in the 21st century. The laser light would spread out over large distances of space, and it would therefore be necessary to focus it using a large Fresnel lens 1,000 km wide, situated between Saturn and Uranus.

Laser beams, Space vehicles, Spacecraft engines

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