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2. Naismith's rule - Wikipedia

   en.wikipedia.org/wiki/Naismith's_rule

   The original Naismith 's rule from 1892 says that one should allow one hour per three miles on the map and an additional hour per 2000 feet of ascent. [1][4] It is included in the last sentence of his report from a trip. [1][8] Today it is formulated in many ways. Naismith's 1 h / 3 mi + 1 h / 2000 ft can be replaced by:

3. Speed to fly - Wikipedia

   en.wikipedia.org/wiki/Speed_to_fly

   The speed to fly is the optimum speed through sinking or rising air mass to achieve either the furthest glide, or fastest average cross-country speed. [1] Most speed to fly setups use units of either airspeed in kilometers per hour (km/h) and climb rate in meters per second (m/s), or airspeed in knots (kn) and climb rate in feet per minute (ft ...

4. Enhanced Fujita scale - Wikipedia

   en.wikipedia.org/wiki/Enhanced_Fujita_scale

   The old scale lists an F5 tornado as wind speeds of 261–318 mph (420–512 km/h), while the new scale lists an EF5 as a tornado with winds above 200 mph (322 km/h), found to be sufficient to cause the damage previously ascribed to the F5 range of wind speeds.

5. List of world records in athletics - Wikipedia

   en.wikipedia.org/wiki/List_of_world_records_in...

   The world best time for a "football 40" is 4.17 by Deion Sanders, while the extrapolated best for an Olympic-level athlete (including reacting to a starting gun) is 4.24 by Maurice Greeneat the 2001 World Championships in Athletics. [249][250]Under conventional football timing on a turf field in 2017, Christian Colemanreportedly ran a 4.12.

6. Mile - Wikipedia

   en.wikipedia.org/wiki/Mile

   The mile, sometimes the international mile or statute mile to distinguish it from other miles, is a British imperial unit and United States customary unit of length; both are based on the older English unit of length equal to 5,280 English feet, or 1,760 yards. The statute mile was standardised between the Commonwealth of Nations and the United ...

7. Beaufort scale - Wikipedia

   en.wikipedia.org/wiki/Beaufort_scale

   For the video game, see Violent Storm. A ship in a force 12 (" hurricane -force") storm at sea, the highest rated on the Beaufort scale. The Beaufort scale (/ ˈboʊfərt / BOH-fərt) is an empirical measure that relates wind speed to observed conditions at sea or on land. Its full name is the Beaufort wind force scale.