Lizards slithering up walls or dangling precariously from overhead lights are a common sight in tropical countries. These slimy creatures zipping up walls are called geckos. They are the only lizard species that make any sound, other than hissing — in fact they make a loud clicking noise that sounds like “gecko”, hence the name.
You get into an elevator (or a lift, as we sometimes call it) and for a second or two, just as the elevator moves down, we feel weightless. On the other hand, if we go up in an elevator, we suddenly feel heavier just as the elevator lurches upwards.
When an apple fell on Newton’s head, he formulated the law of gravity. According to this law, every object is attracted towards the centre of the earth with a force called the gravitational force.
But if Newton were to see this ring suspended in mid-air without any support, one wonders what he would have done.
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