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  2. Four fours - Wikipedia

    en.wikipedia.org/wiki/Four_fours

    Four fours. Four fours is a mathematical puzzle, the goal of which is to find the simplest mathematical expression for every whole number from 0 to some maximum, using only common mathematical symbols and the digit four. No other digit is allowed. Most versions of the puzzle require that each expression have exactly four fours, but some ...

  3. Three utilities problem - Wikipedia

    en.wikipedia.org/wiki/Three_utilities_problem

    Two views of the utility graph, also known as the Thomsen graph or. The classical mathematical puzzle known as the three utilities problem or sometimes water, gas and electricity asks for non-crossing connections to be drawn between three houses and three utility companies in the plane. When posing it in the early 20th century, Henry Dudeney ...

  4. The Scientific Method: What Is It? - WebMD

    www.webmd.com/a-to-z-guides/what-is-the...

    The scientific method is a systematic way of conducting experiments or studies so that you can explore the world around you and answer questions using reason and evidence. It's a step-by-step ...

  5. Brain Exercises: 13 Ways to Boost Memory, Focus, and Mental ...

    www.healthline.com/health/mental-health/brain...

    Try to use that word five times the next day. 4. Dance your heart out. The Centers for Disease Prevention and Control notes that learning new dance moves can increase your brain’s processing ...

  6. Hilbert's problems - Wikipedia

    en.wikipedia.org/wiki/Hilbert's_problems

    The following are the headers for Hilbert's 23 problems as they appeared in the 1902 translation in the Bulletin of the American Mathematical Society. [1] 1. Cantor's problem of the cardinal number of the continuum. 2. The compatibility of the arithmetical axioms. 3. The equality of the volumes of two tetrahedra of equal bases and equal altitudes.

  7. 8 Ways to Increase Your IQ Levels - Healthline

    www.healthline.com/health/how-to-increase-iq

    1. Memory activities. Memory activities don’t only improve memory but can also enhance reasoning and language skills. In fact, memory games have been used in research studies to explore how ...

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