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  2. RuneScape - Wikipedia

    en.wikipedia.org/wiki/RuneScape

    Players begin in a secluded area called Tutorial Island, where they are taken through a tutorial, a set path where they learn the most basic skills in RuneScape. [15] [16] After the tutorial, players have access to tutors and advisors located in the towns they explore, who can give players appropriate information about their respective skills. [17]

  3. Equal-area projection - Wikipedia

    en.wikipedia.org/wiki/Equal-area_projection

    In cartography, an equivalent, authalic, or equal-area projection is a map projection that preserves relative area measure between any and all map regions. Equivalent projections are widely used for thematic maps showing scenario distribution such as population, farmland distribution, forested areas, and so forth, because an equal-area map does ...

  4. ALCO RS-3 - Wikipedia

    en.wikipedia.org/wiki/ALCO_RS-3

    A fifth unit, number 1604, was purchased in 1971 from the Burlington Northern Railroad (BN), a piece of surplus Great Northern Railway stock from the 1970 merger that formed BN. The locomotives served until 1984, when the line was converted to 1,000 mm ( 3 ft 3 + 3 ⁄ 8 in ) metre gauge .

  5. Stefan–Boltzmann law - Wikipedia

    en.wikipedia.org/wiki/Stefan–Boltzmann_law

    The quantity (,) ⁡ is the power radiated by a surface of area A through a solid angle dΩ in the frequency range between ν and ν + dν. The Stefan–Boltzmann law gives the power emitted per unit area of the emitting body, P A = ∫ 0 ∞ I ( ν , T ) d ν ∫ cos ⁡ θ d Ω {\displaystyle {\frac {P}{A}}=\int _{0}^{\infty }I(\nu ,T)\,d\nu ...

  6. Number density - Wikipedia

    en.wikipedia.org/wiki/Number_density

    Using the number density as a function of spatial coordinates, the total number of objects N in the entire volume V can be calculated as = (,,), where dV = dx dy dz is a volume element. If each object possesses the same mass m 0 , the total mass m of all the objects in the volume V can be expressed as m = ∭ V m 0 n ( x , y , z ) d V ...

  7. Squared triangular number - Wikipedia

    en.wikipedia.org/wiki/Squared_triangular_number

    A square whose side length is a triangular number can be partitioned into squares and half-squares whose areas add to cubes. From Gulley (2010).The n th coloured region shows n squares of dimension n by n (the rectangle is 1 evenly divided square), hence the area of the n th region is n times n × n.

  8. Dymaxion map - Wikipedia

    en.wikipedia.org/wiki/Dymaxion_map

    The Dymaxion map projection, also called the Fuller projection, is a kind of polyhedral map projection of the Earth's surface onto the unfolded net of an icosahedron. The resulting map is heavily interrupted in order to reduce shape and size distortion compared to other world maps , but the interruptions are chosen to lie in the ocean.

  9. Mechanical calculator - Wikipedia

    en.wikipedia.org/wiki/Mechanical_calculator

    Friden made a calculator that also provided square roots, basically by doing division, but with added mechanism that automatically incremented the number in the keyboard in a systematic fashion. The last of the mechanical calculators were likely to have short-cut multiplication, and some ten-key, serial-entry types had decimal-point keys.