Show W weekly guide to science dy by permission of POPULAR SCIENCE MONTHLY HOV DO it ME E KNOW COUNTRY arouni NORTH AND bolth POLES WAS ONCE waita in samples of 0 rock which explorers have brought b back ack from the polar regions a geologists have bave found fossils of plants aich grow only in warn warm countries evidently these plants once grew near the poles ets SCIENCE PROVED TUB till EXISTENCE OF THE LOST CONTINENT no it Is possible that there was once a body of 0 land where the south atlantic ocean now Is but that was a great many million years ago long before man or any clea cleasure ture at all like man was living on oil earth the ancient legend ot of atlantis was wa s p probably y derived irom from knowledge of 1 the A azores U lands islands together with stories ot of manners ma who happened to get tar far enough west to see america HV ARE THERE SO MANY DIANY ANIMALS IN australia has been an island cut off from the rest ot of the since many millions of years back in the geologic past some ot of the very anicent animals have been able to live on in australia though com competition 0 n with newer animal forms has hag killed them oft off elsewhere in the world 11 WAS THU THE FIRST AN ANIMAL TO BE domesticated probably the dog though it Is pos elble that in some parts ot of the earth the sheep heep or the pig may have been partially domesticated before the dog was or 01 oil at about the same time ARE AHE THE OLDEST KNOWN WORKS OF ART the drawings paintings and sculptures made toy by prehistoric man in caves in france aud and spain during the old stone age they are twenty or thirty thousand years old perhaps much older some ot of them represent art or of a high order but all the drawings aie made in profile as children draw these ancient artists lacked knowledge of 0 perspective HOW OLD IS THE OLDEST PYRAMID IN EGYPT i about years the oldest pyramid is that built by king Sene tru who reigned about B C its exact date Is unknown HOW CAN USE THE BIG TREES IN california TO DETERMINE T THE ILE CLIMATE IN THE TIME OF CHRIST the growth of trees Is marked by annual rings in the trunk and the width of the rings tells us something about the rainfall the more rain the wider the ring ol of growth some of 0 the big trees of Cali Call fornal have been alive tor for over years their growth rings show that at the time of christ the climate in california was considerably moister than it Is today WHAT 1 IS 13 THE CLIMATIC THEORY OF HISTORY this theory says that climate Is a 96 changeable thing that drier periods and moister periods alternate with each other during dry periods there are crop failures and great suffering this makes whole peoples migrate and changes the cour course s e ol of hi history the invasion of europe by the huns was one ot of these climatic migrations caused by crop failures on the russian steppes DID BACTERIA E EXIST KIST BEFORE MAN yes hundreds of millions ot years before fossil bacteria have been found in montana in some of the earliest known rocks probably more than eight hundred million years old |