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endangered species

Life on Earth exists in a balance between the environment and the plants and animals that live on it. Throughout history, animals have become extinct when the environment changed. Scientists have discovered and documented many animals that have become extinct by studying fossils. Today, many species o... read more

why are circles 360 degrees and not a round number

Circles have 360 degrees due to the Sumerians’ observations of the Sun’s motion across the sky. ... read more

the life cycle

The stages of human life are often described as a life cycle. For each individual, however, life is a straight line. Like a story, it has a beginning, middle, and an end. The earliest stage of life is a single cell. The cell divides and, with instructions from genes, forms different tissues. These tis... read more

why do toucans have such big beaks

Toucans have large beaks in order to regulate their body temperature. ... read more

how do polarised sunglasses work

Polarised sunglasses have filters that block some light waves while letting others through. ... read more