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  2. Population bottleneck - Wikipedia

    en.wikipedia.org/wiki/Population_bottleneck

    A population bottleneck or genetic bottleneck is a sharp reduction in the size of a population due to environmental events such as famines, earthquakes, floods, fires, disease, and droughts; or human activities such as genocide, speciocide, widespread violence or intentional culling. Such events can reduce the variation in the gene pool of a ...

  3. New London School explosion - Wikipedia

    en.wikipedia.org/wiki/New_London_School_explosion

    New London School explosion. The New London School explosion occurred on March 18, 1937, when a natural gas leak caused an explosion and destroyed the London School in New London, Texas, United States. [1] The disaster killed more than 300 students and teachers. As of 2021, the event is the third-deadliest disaster in the history of Texas ...

  4. Genetic engineering - Wikipedia

    en.wikipedia.org/wiki/Genetic_engineering

    This is an accepted version of this page This is the latest accepted revision, reviewed on 15 September 2024. Manipulation of an organism's genome For a non-technical introduction to the topic of genetics, see Introduction to genetics. For the song by Orchestral Manoeuvres in the Dark, see Genetic Engineering (song). For the Montreal hardcore band, see Genetic Control. Part of a series on ...

  5. Post-traumatic stress disorder - Wikipedia

    en.wikipedia.org/wiki/Post-traumatic_stress_disorder

    Post-traumatic stress disorder (PTSD) [b] is a mental and behavioral disorder [8] that develops from experiencing a traumatic event, such as sexual assault, warfare, traffic collisions, child abuse, domestic violence, or other threats on a person's life or well-being.

  6. Genetics - Wikipedia

    en.wikipedia.org/wiki/Genetics

    Genetics is the study of genes, genetic variation, and heredity in organisms. [1][2][3] It is an important branch in biology because heredity is vital to organisms' evolution. Gregor Mendel, a Moravian Augustinian friar working in the 19th century in Brno, was the first to study genetics scientifically. Mendel studied "trait inheritance ...

  7. List of natural disasters in the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_natural_disasters...

    90. $3.9 billion. Tornado outbreak of December 10–11, 2021. Kentucky, Illinois, Tennessee, Missouri, Arkansas. A rare late-season tornado outbreak devastated states across the mid-south midwest, causing widespread damage and fatalities. Kentucky was particularly hard hit, with 75 fatalities occurring in the state.

  8. Crisis of the late Middle Ages - Wikipedia

    en.wikipedia.org/wiki/Crisis_of_the_late_Middle_Ages

    The crisis of the Middle Ages was a series of events in the 14th and 15th centuries that ended centuries of European stability during the late Middle Ages. [1] Three major crises led to radical changes in all areas of society: demographic collapse, political instability, and religious upheavals. [2] Crisis of the late Middle Ages.

  9. Secondary education in the United States - Wikipedia

    en.wikipedia.org/wiki/Secondary_education_in_the...

    Secondary education is the last six or seven years of statutory formal education in the United States. It culminates with twelfth grade (age 17–18). Whether it begins with sixth grade (age 11–12) or seventh grade (age 12–13) varies by state and sometimes by school district. [1]

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