Sunday, January 8, 2012
Friday, January 6, 2012
Pyramid
A Pyramid is a structure whose outer surfaces are triangular and converge at a single point. The base of a pyramid can be trilateral, quadrilateral, or any polygon shape, meaning that a pyramid has at least three triangular surfaces (at least four faces including the base). The square pyramid, with square base and four triangular outer surfaces, is a common version.
A pyramid's design, with the majority of the weight closer to the ground and with the pyramiding on top means that less material higher up on the pyramid will be pushing down from above. This distribution of weight allowed early civilizations to create stable monumental structures.
Wednesday, January 4, 2012
Sinai Agama
The Sinai Agama is an Agamid Lizard native to Northern and Eastern Africa and the Middle East. It grows to about 25 cm long, with the tail accounting for up to two thirds of the total length. It is active during daytime and feeds on insects and other arthropods and plants. During the Breeding Season, Males become a striking Blue Colour to attract Females.
Monday, January 2, 2012
Sunday, January 1, 2012
MODIS_Map
An image of the Earth's cloud cover, which is the amount of sky obscured by clouds, based largely on observations from NASA's Moderate Resolution Imaging Spectroradiometer (MODIS) on board the Terra satellite. Clouds play multiple critical roles in the climate system. In particular, being bright objects in the visible part of sunlight, they efficiently reflect light to space and thus contribute to the cooling of the planet.
Image: Marit Jentoft-Nilsen, NASA
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