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  2. Tower defense - Wikipedia

    en.wikipedia.org/wiki/Tower_defense

    Tower defense is seen as a subgenre of real-time strategy video games, due to its real-time origins, [2] [3] even though many modern tower defense games include aspects of turn-based strategy. Strategic choice and positioning of defensive elements is an essential strategy of the genre.

  3. Calculator input methods - Wikipedia

    en.wikipedia.org/wiki/Calculator_input_methods

    On a single-step or immediate-execution calculator, the user presses a key for each operation, calculating all the intermediate results, before the final value is shown. [ 1 ] [ 2 ] [ 3 ] On an expression or formula calculator , one types in an expression and then presses a key, such as "=" or "Enter", to evaluate the expression.

  4. Toxic unit - Wikipedia

    en.wikipedia.org/wiki/Toxic_unit

    Toxic units (TU) are used in the field of toxicology to quantify the interactions of toxicants in binary mixtures of chemicals. [1] A toxic unit for a given compound is based on the concentration at which there is a 50% effect (ex. EC50) for a certain biological endpoint. One toxic unit is equal to the EC50 for a given endpoint for a specific ...

  5. Statistical unit - Wikipedia

    en.wikipedia.org/wiki/Statistical_unit

    Ignoring these dependencies, the analysis can lead to an inflated sample size or pseudoreplication. While a unit is often the lowest level at which observations are made, in some cases, a unit can be further decomposed as a statistical assembly. Many statistical analyses use quantitative data that have units of measurement. This is a distinct ...

  6. Flush toilet - Wikipedia

    en.wikipedia.org/wiki/Flush_toilet

    This system is suitable for locations plumbed with 12.7 or 9.5 mm (1 ⁄ 2 or 3 ⁄ 8 inch) water pipes which cannot supply water quickly enough to flush the toilet; the tank is needed to supply a large volume of water in a short time. The tank typically collects between 6 and 17 L (1.6 and 4.5 US gallons) of water over a period of time.

  7. Fixture unit - Wikipedia

    en.wikipedia.org/wiki/Fixture_unit

    A Fixture Unit is not a flow rate unit but a design factor. A fixture unit is equal to 1 cubic foot (0.028 m 3) of water drained in a 1 + 1 ⁄ 4 inches (32 mm) diameter pipe over one minute. [2] One cubic foot of water is roughly 7.48 US gallons (28.3 L; 6.23 imp gal). A Fixture Unit is used in plumbing design for both water supply and waste ...

  8. Composting toilet - Wikipedia

    en.wikipedia.org/wiki/Composting_toilet

    A composting toilet consists of two elements: a place to sit or squat and a collection/composting unit. [3] The composting unit consists of four main parts: [2] storage or composting chamber; a ventilation unit to ensure that the degradation process in the toilet is predominantly aerobic and to vent odorous gases

  9. Toilet (room) - Wikipedia

    en.wikipedia.org/wiki/Toilet_(room)

    [2] [3] At present, the word refers primarily to such fixtures and using "toilet" to refer to the room or activity ("use the toilet") is somewhat blunt and may be considered indiscreet. [4] [n 1] It is, however, a useful term since it is quickly understood by English-speakers across the world, whereas more polite terms vary by region.