insects

both in terms of species and sheer numbers,insects out number all other animals on earth.they are the most successful creatures on the planet.

more than a million different species of insect has been scientifically named and described and thousand more are discovered every year.thanks to theoir amazing adaptations they flourish in every land habitat and play a key role in the global ecosystem recycling dead plants and animals.in fact that we could not survive without them.  

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how vision works

vision is the most important sense in humans.we gather more information through our eyes than through all our other senses combined. it takes a fraction of second for our eyes to take in a scene.they dont simply take a snapshot.instead our eyes dart about quickly and instinctively resting briefly on details that the brain considers important such as faces moving objects and anything that interests us.the human eye works much like a camera capturing light rays and focusing them with lens to form a pin sharp image.unlike a photograph the image in our eyes is highly detailed and brightly coloured only in the very centre.this small sharp spot in our visual field is created by a tiny pit in the back of the eye called fovea.your fovea forms high defination images of the words in this sentence as u read it.
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