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  2. Doomsday Clock - Wikipedia

    en.wikipedia.org/wiki/Doomsday_Clock

    In other years, the Clock's time has fluctuated from 17 minutes in 1991 to 2 minutes 30 seconds in 2017. [14] [23] Discussing the change in 2017, Lawrence Krauss, one of the scientists from the Bulletin, warned that political leaders must make decisions based on facts, and those facts "must be taken into account if the future of humanity is to ...

  3. List of radioactive nuclides by half-life - Wikipedia

    en.wikipedia.org/wiki/List_of_radioactive...

    This is a list of radioactive nuclides (sometimes also called isotopes), ordered by half-life from shortest to longest, in seconds, minutes, hours, days and years. Current methods make it difficult to measure half-lives between approximately 10 −19 and 10 −10 seconds.

  4. 4′33″ - Wikipedia

    en.wikipedia.org/wiki/4′33″

    At the end of each sentence, there is information about each movement's duration in minutes and seconds; these are: 'I = 30 seconds', 'II = 2 minutes 23 seconds' and 'III = 1 minute 40 seconds'. [67] Tudor commented: "It's important that you read the score as you're performing it, so there are these pages you use. So you wait, and then turn the ...

  5. Orders of magnitude (time) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(time)

    single seconds (1 das = 10 s) 6 das: One minute (min), the time it takes a second hand to cycle around a clock face 10 2: hectosecond hs minutes (1 hs = 1 min 40 s = 100 s) 2 hs (3 min 20 s): The average length of the most popular YouTube videos as of January 2017 [15] 5.55 hs (9 min 12 s): The longest videos in the above study

  6. Metric time - Wikipedia

    en.wikipedia.org/wiki/Metric_time

    10 2: hectosecond: 100: 1.67 minutes (or 1 minute 40 seconds) 10 3: kilosecond: 1 000: 16.7 minutes (or 16 minutes and 40 seconds) 10 6: megasecond: 1 000 000: 11.6 days (or 11 days, 13 hours, 46 minutes and 40 seconds) 10 9: gigasecond: 1 000 000 000: 31.7 years (or 31 years, 252 days, 1 hour, 46 minutes, 40 seconds, assuming that there are 7 ...

  7. Minute and second of arc - Wikipedia

    en.wikipedia.org/wiki/Minute_and_second_of_arc

    Minutes (′) and seconds (″) of arc are also used in cartography and navigation. At sea level one minute of arc along the equator equals exactly one geographical mile (not to be confused with international mile or statute mile) along the Earth's equator or approximately one nautical mile (1,852 metres; 1.151 miles). [14]

  8. 24-hour clock - Wikipedia

    en.wikipedia.org/wiki/24-hour_clock

    24-hour digital clock in Miaoli HSR station. A public 24-hour clock in Curitiba, Brazil, with the hour hand on the outside and the minute hand on the inside.. A time of day is written in the 24-hour notation in the form hh:mm (for example 01:23) or hh:mm:ss (for example, 01:23:45), where hh (00 to 23) is the number of full hours that have passed since midnight, mm (00 to 59) is the number of ...

  9. Moment (unit) - Wikipedia

    en.wikipedia.org/wiki/Moment_(unit)

    Although the length of a moment in modern seconds was therefore not fixed, on average, a medieval moment corresponded to 90 seconds. A solar day can be divided into 24 hours of either equal or unequal lengths, [ 2 ] [ 3 ] the former being called natural or equinoctial, and the latter artificial.