Knowledge

  The main source of light on Earth is the   Sun .   Sunlight   provides the   energy   that   green plants   use to create   sugars   mostly in the form of   starches , which release energy into the living things that digest them. This process of   photosynthesis   provides virtually all the energy used by living things. Historically, another important source of light for humans has been   fire , from ancient campfires to modern   kerosene lamps . With the development of   electric lights   and   power systems , electric lighting has effectively replaced firelight. Some species of animals generate their own light, a process called   bioluminescence . For example,   fireflies   use light to locate mates, and   vampire squids   use it to hide themselves from prey. The primary properties of visible light are  intensity , propagation direction, frequency or wavelength  spectrum , and  polarization , while its  speed in a vacuum , 299,792,458 meters per second, is one of the fundamental  c

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 Horse behavior  Horses are prey animals with a strong fight-or-flight response. Their first reaction to a threat is to startle and usually flee, although they will stand their ground and defend themselves when flight is impossible or if their young are threatened. They also tend to be curious; when startled, they will often hesitate an instant to ascertain the cause of their fright, and may not always flee from something that they perceive as non-threatening. Most light horse riding breeds were developed for speed, agility, alertness and endurance; natural qualities that extend from their wild ancestors. However, through selective breeding, some breeds of horses are quite docile, particularly certain draft horses. Horses are herd animals, with a clear hierarchy of rank, led by a dominant individual, usually a mare. They are also social creatures that are able to form companionship attachments to their own species and to other animals, including humans. They communicate in various ways