Since many children do not adjust well, their behavior is affected.

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Gasoline use in automobiles is one of the major causes of pollution.

If the legacy of the Vietnam War is to offer any guidance, we need to complete the moral and political reckoning it awakened. And if our nation’s future is to be less militarized, our empire of foreign military bases scaled back, and our pattern of endless military interventions ended, a necessary first step is to reject – fully and finally – the stubborn insistence that our nation has been a unique and unrivaled force for good in the world. Only an honest accounting of our history will allow us to chart a new path in the world. The past is always speaking to us, if we only listen.

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The missing piece is a global growth agenda led by a U.S.

To revisit the Neanderthal split from about 500 kya, stayed in West Asia and Africa. When evidence of came to light, some scientists placed the beginning of the at about 500 kya. Stone tools have recently been dated using , which works for stone tools heated by fires, and using . That method measures water absorption into the surface of obsidian tools. For dating artifacts before the appearance of behaviorally modern humans about 70-50 kya, will not work, but successful. Neanderthals dominated Europe and today’s Middle East while home was Africa, and they also ranged to Europe and West Asia. Whether existed for only a half-million years or a million is controversial today, but what is not very controversial is that it is probably the direct ancestor of both Neanderthals and , and the first members of our species appeared in Africa about 200 kya. There is evidence that other descendants of may have existed, and . It also could have been a Neanderthal descendant. As with the discovery of the “” of Flores Island, it will not be surprising if scientists find more species that branched off of those early human and protohuman lines and died out when behaviorally modern humans spread across Africa and Eurasia.

The Volkswagen Beetle is an evil car because it was originally designed by Hitler's army.
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In the aftermath of My Lai, more atrocity stories came to light, many told by GIs and veterans themselves. To limit the damage, the Pentagon assembled a secret Vietnam War Crimes Working Group that gathered more than 300 criminal investigation reports, testimonies, and allegations of atrocities, including massacres, murders, rapes, torture, assaults, mutilations, and the execution of prisoners. The purpose of the working group was not to administer justice but to bury the evidence in top-secret classification. The Pentagon framed My Lai as an “isolated incident,” the product of a few “bad apples,” and kept the lid on information and reports regarding other atrocities, including the massacre at My Khe that same day. It refused to investigate many of the allegations by GIs and vets in the interest of keeping the extent of atrocities under wraps. This went beyond public image making, as the generals themselves could be charged with war crimes under international law (in the tradition of the Nuremberg Trials) should a consistent pattern of atrocities and cover-ups be proven.

However, the recent enforcement of this law is causing traffic problems citywide.
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The most coveted fuel of the Industrial Revolution is first used.

As will be explored in this essay, all of the marine life have anoxia as a suspected contributing cause, so oxygen is a major area of interest among extinction specialists. Whether oxygen levels were also significant contributing causes of evolutionary innovation is another area of interest today. Again, to food chains. Even if the first animals did not respire anaerobically, they adapted to aerobic respiration early on and then became dependent on it. There would be no going back for animals; all except those few adapted to and anoxic environments went “all in” with aerobic respiration.

USA harnesses the atom's power, and first use is , and the

An irony of fossilization is that conditions hostile to life usually , because nothing disturbed the sediments, which were and often sulfidic. In the sea sediments that mark the geologic periods, white limestone and black shale are typical layers. Limestone means oxygenated oceans, and black shales and mudstones mean anoxic conditions. The black color means carbon, as the ecosystems could not recycle the carbon and it was instead preserved into the sediments which have been the burned in today’s industrialized world.

This is anathema to libertarians and Austrian School economists.

But the branch of the that readers might find most interesting led to humans. Humans are in the phylum, and the last common ancestor that founded the Chordata phylum is still a mystery and understandably a source of controversy. Was our ancestor a ? A ? Peter Ward made the case, as have others for a long time, that it was the sea squirt, also called a tunicate, which in its larval stage resembles a fish. The nerve cord in most bilaterally symmetric animals runs below the belly, not above it, and a sea squirt that never grew up may have been our direct ancestor. Adult tunicates are also highly adapted to extracting oxygen from water, even too much so, with only about 10% of today’s available oxygen extracted in tunicate respiration. It may mean that tunicates adapted to low oxygen conditions early on. Ward’s respiration hypothesis, which makes the case that adapting to low oxygen conditions was an evolutionary spur for animals, will repeatedly reappear in this essay, as will . Ward’s hypothesis may be proven wrong or will not have the key influence that he attributes to it, but it also has plenty going for it. The idea that fluctuating oxygen levels impacted animal evolution has been gaining support in recent years, particularly in light of recent reconstructions of oxygen levels in the eon of complex life, called and , which have yielded broadly similar results, but their variances mean that much more work needs to be performed before on the can be done, if it ever can be. Ward’s basic hypotheses is that when oxygen levels are high, ecosystems are diverse and life is an easy proposition; when oxygen levels are low, animals adapted to high oxygen levels go extinct and the survivors are adapted to low oxygen with body plan changes, and their adaptations helped them dominate after the extinctions. The has a pretty wide range of potential error, particularly in the early years, and it also tracked atmospheric carbon dioxide levels. The challenges to the validity of a model based on data with such a wide range of error are understandable. But some broad trends are unmistakable, as it is with other models, some of which are generally declining carbon dioxide levels, some huge oxygen spikes, and the generally relationship between oxygen and carbon dioxide levels, which a geochemist would expect. The high carbon dioxide level during the Cambrian, of at least 4,000 PPM (the "RCO2" in the below graphic is a ratio of the calculated CO2 levels to today's levels), is what scientists think made the times so hot. (Permission: Peter Ward, June 2014)