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Making a 'gusher' with compressed air Secure a large narrow-necked bottle like as is used for soda water. Place a single-hole stopper in the bottle. By the stopper put a 10- cm
Fibre optics: The songs you hear on your transistor, or the pictures you see on your TV are canied from the studios to your home on radiowaves. Telephone calls you make, on th
What determines sinking and floating? Shape a piece of lead, tin or aluminium foil into the form of a little boat and float it on the water in a pan; now wad the metal foil fro
Rejection of Heliocentrism: This happened in the year 1918 when the astronomer Harlow Shapley (1885-1972) first surveyed the size and shape of the Milky Way Galaxy. He sh
Types of soils Secure samples of soil from as many places as possible and place in glass jars. Try to get examples of a sandy soil, a loam soil, a clay soil, a soil rich in dec
Emergence of Science: We gave you a glimpse of the social structure in India during the Iron Age. With the emergence of ordered urban societies, the stage was set for a tre
special or unique organelles and how they assist euglena
Evidence Favouring the Big Bang One piece of evidence comes from the expansion of the universe which we have already described. The expanding universe suggests that the matt
similarity between granite and rhyolite
Structure of the brain. Include different parts and their function.
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