THE DINOSAURS

 For 165 million years life on earth was dominated by the most spectacular animals that have ever existed-the dinosaurs.

 The mesozoic era was a high point in the history of life because itwas the age of dinosaurs.these fantastic creatures included the biggest heaviest and most terrifying of all land animals.They evolved into an amazing variety of forms ranging from huge armoured leaf eaters to nimble feathered hunters and gave rise to the birds that still flourish today.

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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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