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Researchers say they have discovered evidence of the oldest dark matter ever observed in the universe. Dark matter remains mysterious. Scientists believe the material makes up more than one quarter of the universe. But it cannot be directly seen or felt. Astronomers have theorized that dark matter exists because of gravity’s observed effects on galaxies. … Read more

Mammals can produce their own body heat and control their body temperatures. This process is known as endothermy or warm-bloodedness. Scientists believe that it may be the reason why mammals likely rule almost every ecosystem. Warm-blooded mammals are more active than cold-blooded animals. They can live in different environments, from the frozen arctic to the … Read more