GENERAL KNOWLEDGE 5: ICE AGES

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GENERAL KNOWLEDGE 5
ICE AGES


The Pleistocene era (beginning 2.58 million years ago) saw several phases in which Earth’s mean temperature dropped and the polar icecaps expanded towards the tropics. These are clustered into four broad ice ages- periods with cool temperatures and a significant continental ice sheet (at times, up to one-third of Earth’s land surface was covered), separated by interglacial periods of 10-15 millennia.
Nomadic humans, with fire, weapons and language, were able to hunt across the tundra and secure caves in which to shelter. Their prey needed larger areas to forage, causing humanity to spread widely in pursuit. Falling sea levels opened up land bridges across today’s oceans -most significantly, the Americans were populated by humans spreading from Mongolia, while horses evolved in America but migrated east before becoming extinct in their native land. The last significant glaciation came to an end 10,000 years ago. The last significant glaciation came to an end 10,000 years ago, although a climatic cooling of about 500 years from century AD 1300 has been noted.

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BOOK REVIEW: ARISTOTLE’S POETICS

GENERAL KNOWLEDGE 4 NEANDERTHALS

GENERAL KNOWLEDGE 4
NEANDERTHALS
Homo neanderthalensis’s close affinity to modern humans and European stronghold meant that it was the first fossil hominid to attract attention (discovered in Germany’s Neander valley in 1857). The Neanderthals seen to have settled after the first wave of hominid migration from Africa and to have persisted until about 40,000 years ago. Homo sapiens, meanwhile, may have arrived from Africa 60,000 years ago, so could have played a major role in Neanderthal extinction. DNA evidence for interbreeding is as yet inconclusive.
Scientists originally surmised that Neanderthals were unintelligent, hunchbacked beings, largely because one of the first skeletons found was of an arthritic man. More recent finds have shown that they were physically powerful, and evidence is increasing of abstract reasoning and large cerebral capacity. Physically capable of limited speech, they had sophisticated flint tools and religious rites –many burial sites have been found


GENERAL KNOWLEDGE 3: WORLD HISTORY.            Out of Africa.                       The genus Homo evolved in Africa a little less than 2.5 million years ago, characterised by increasingly large brains that equipped them better for survival –their predecessors the australopithecines became extinct soon thereafter. Mary and Louis Leaky became famous for their discovery of the Homo habilis site in Tanzania’s Olduvai Gorge- a small ape – like biped that was skilled with stone tools (hence the name). Later hominids were larger, stronger and more anthropomorphic.The fossil record shows that hominids spread from Africa to Europe and Asia in multiple waves beginning about 2 million years ago (exactly how many species were involved, and how recently some survived, remains uncertain). They appear to have developed vocalisation, hunter-gatherer social groups and the use of fire over the next million years. The current scientific consensus, supported by DNA studies, is that modern humans arose in Africa 200,000 years ago, before spreading out, replacing and interbreeding with other hominids.


World History 2…Tools, Art and Belief

WORLD HISTORY 2
TOOLS, ART AND BELIEF


    While many animals have learned to manipulate objects such as twigs to release food from inaccessible places, humans are the clearest example of what psychologists  call ‘theory of mind’. Early art indicates that this is as old as humanity -depictions of people and events are physical manifestations of mental processes, made to look recognizable to others, and with this came other significant abilities.
    One is that an individual can imagine what another individual might do; verbal communication can go beyond information and orders into storytelling and attempts to guess another’s reactions: associated regions of the brain developed rapidly in this period (some have suggested that civilization began with the ability to gossip). Another is that complex and abstract notions can be relayed, including plans for hunts or future projects – things that cannot be seen. A third consequence is a realisation that this ability ends when an individual dies: surprisingly early, we find humans buried with personal objects.
The ‘Venus of Willendorf’ is one of the most famous examples of prehistoric sculpture, dating to around 26,000 BC.

WORLD HISTORY 1: Lucy and her Kin

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Lucy and her kin

One of the most famous fossils ever discovered, Lucy is the skeletal remains of an Australopithecus afarensis. Found in Ethiopia in 1974, she lived around 3.2 million years ago and was a bipedal hominid, with feet adapted for walking upright. The history of human evolution extends both forwards and backwards from this point. Hominidae, the taxonomic family that humans share with their closest living relatives, the great, apes (gorillas, chimpanzees, orangutans and bonobos, the last controversially suggested to be closer to Lucy than modern humans) shared a common ancestry until quite recently in evolutionary terms, perhaps differentiating 6 million years or so ago. The first beings to walk upright comfortably seem to have been the Australopithecus genus, developing around 4 million years ago; they had smaller brains than even modern apes, and became extinct perhaps 2 million years ago. But they were able to develop tools, and genus Homo (which includes modern humans) evolved from them.

Poem: In Nature’s Lap

By Kamlesh Tripathi

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Happy to share my poem titled ‘In Nature’s Lap’ carried by the Shillong Times yesterday. I wrote this poem in the beautiful surroundings of The Kasauli club in Himachal Pradesh. Hope you like it.

Appreciation received from a reader:

Kamlesh
You are blessed with the ability of seeing the beauty of the Lord’s creation and also give a glimpse of it through your words to others.
It makes a difference in our lives – I know in my Life…
Please keep it up.
Pradip…

EVERY “WHY” HAS A “WHEREFORE”