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  2. The evolutionary origin of birds was an open question in paleontology for over a century, but the modern scientific consensus is that birds evolved from small feathered theropods in the Jurassic. Not all dinosaur lineages were cut short at the end of the Cretaceous during the Cretaceous–Paleogene extinction event , and over 11,000 species of ...

  3. Pythagorean addition - Wikipedia

    en.wikipedia.org/wiki/Pythagorean_addition

    In mathematics, Pythagorean addition is a binary operation on the real numbers that computes the length of the hypotenuse of a right triangle, given its two sides.Like the more familiar addition and multiplication operations of arithmetic, it is both associative and commutative.

  4. Minkowski's question-mark function - Wikipedia

    en.wikipedia.org/wiki/Minkowski's_question-mark...

    In mathematics, Minkowski's question-mark function, denoted ?(x), is a function with unusual fractal properties, defined by Hermann Minkowski in 1904. [1] It maps quadratic irrational numbers to rational numbers on the unit interval , via an expression relating the continued fraction expansions of the quadratics to the binary expansions of the ...

  5. Upper and lower bounds - Wikipedia

    en.wikipedia.org/wiki/Upper_and_lower_bounds

    In mathematics, particularly in order theory, an upper bound or majorant [1] of a subset S of some preordered set (K, ≤) is an element of K that is greater than or equal to every element of S. [ 2 ] [ 3 ] Dually , a lower bound or minorant of S is defined to be an element of K that is less than or equal to every element of S .

  6. High-yield savings rates for January 20, 2025 - AOL

    www.aol.com/finance/savings-interest-rates-today...

    Get today's best rates on high-yield FDIC-insured savings accounts to more quickly grow your everyday money, build an emergency reserve or save for a successful retirement.

  7. Arc length - Wikipedia

    en.wikipedia.org/wiki/Arc_length

    Development of a formulation of arc length suitable for applications to mathematics and the sciences is a focus of calculus. In the most basic formulation of arc length for a parametric curve (thought of as the trajectory of a particle), the arc length is obtained by integrating the speed of the particle over the path.

  8. The Two Ronnies Sketchbook - Wikipedia

    en.wikipedia.org/wiki/The_Two_Ronnies_Sketchbook

    The sketches chosen were considered true classics - the short-sighted optician, 'Your nuts, m'lord', the Mastermind spoof (Specialist subject: Answering the Question Before Last), and, the sketch voted the nation's favourite, Four Candles (this last sketch was kept until the very end of the sixth episode, pretending they had forgotten about it ...

  9. Online tutoring - Wikipedia

    en.wikipedia.org/wiki/Online_tutoring

    In general, academic online tutors are available through various virtual learning environments to help learners answer questions on specific subject matter, to help in the writing of essays, and to assist with research. Offerings vary from sites loosely associated with campuses, to sites directly contracted by and operating in concert with ...

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