Single-celled microorganisms that can exist either as independent (free-living) organisms or as parasites (dependent on another organism for life). The plural of bacterium.

French physicist, born in Paris (1852-1908). Becquerel's most famous work is his study of uranium salts, which he discovered produced rays that caused gas to ionize. This type of radiation was termed Becquerel radiation.

The term "Big Bang" was coined by Fred Hoyle in 1949 to describe an event 13.7 million years ago involving the rapid expansion of matter and energy from a single hot, dense point

A term coined by Sir William Herschel in 1802 to describe a pair of stars that revolve around a common mass and are unaffected by the mass of other stars, creating their own system.

Materials that will decompose into naturally occurring, harmless components with exposure to air, sunlight and/or moisture.

The variety of life in all its forms, levels and combinations. This phrase acts as generic terminology for Eco-system diversity, species diversity, and genetic diversity.

A fuel produced from dry organic matter or combustible oils produced by plants. Examples of biofuel include alcohol, bio diesel from vegetable oil and wood.

The total mass of all living organisms within a biological community. Biomass usually refers to plant matter grown for use as Biofuel, but also includes plant or animal matter used for production of fibres, chemicals or heat. Biomass may also include Biodegradable wastes that can be burnt as fuel.

The part of the earth and its atmosphere in which living organisms exist or that is capable of supporting life

A region of space-time where gravity prevents anything, including light, from escaping

Water from toilets, kitchen sink, or other dirty sources, which could be contaminated with microorganisms or harmful bacteria.