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  2. Geological history of oxygen - Wikipedia

    en.wikipedia.org/wiki/Geological_history_of_oxygen

    Photosynthetic prokaryotic organisms that produced O 2 as a byproduct lived long before the first build-up of free oxygen in the atmosphere, [5] perhaps as early as 3.5 billion years ago. The oxygen cyanobacteria produced would have been rapidly removed from the oceans by weathering of reducing minerals, [citation needed] most notably ferrous ...

  3. Great Oxidation Event - Wikipedia

    en.wikipedia.org/wiki/Great_Oxidation_Event

    Oxygen, O 2, meanwhile, was present in the atmosphere at just 0.001% of its present atmospheric level. [12] [13] The Sun shone at about 70% of its current brightness 4 billion years ago, but there is strong evidence that liquid water existed on Earth at the time. A warm Earth, in spite of a faint Sun, is known as the faint young Sun paradox. [14]

  4. Capital punishment - Wikipedia

    en.wikipedia.org/wiki/Capital_punishment

    The last execution in San Marino had taken place in 1468. In Portugal, after legislative proposals in 1852 and 1863, the death penalty was abolished in 1867. The last execution in Brazil was 1876; from then on all the condemnations were commuted by the Emperor Pedro II until its abolition for civil offences and military offences in peacetime in ...

  5. Alabama plans to execute a man using nitrogen gas. How will ...

    www.aol.com/alabama-plans-execute-man-using...

    Alabama is poised to use nitrogen gas in a planned execution next month — making it the first of any state to attempt such a method and setting the stage for legal challenges.

  6. Capital punishment in the United States - Wikipedia

    en.wikipedia.org/wiki/Capital_punishment_in_the...

    Three states abolished the death penalty for murder during the 19th century: Michigan (which Only executed 1 prisoner and is the first government in the English-speaking world to abolish capital punishment) [38] in 1847, Wisconsin in 1853, and Maine in 1887.

  7. Capital punishment by country - Wikipedia

    en.wikipedia.org/wiki/Capital_punishment_by_country

    German Democratic Republic (country which ceased to exist in 1990 and all of its territory joined the Federal Republic of Germany) abolished the death penalty in 1987, the last execution was held in 1981. Greece: 1972 2004 [360] [361

  8. Alabama calls nitrogen execution method painless and ... - AOL

    www.aol.com/news/alabama-calls-nitrogen...

    The Alabama attorney general's office told federal appeals court judges last week that nitrogen hypoxia is "the most painless and humane method of execution known to man."

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!