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2. Walking - Wikipedia

   en.wikipedia.org/wiki/Walking

   Stride length is reduced, so to achieve competitive speeds, racewalkers must attain cadence rates comparable to those achieved by Olympic 800-meter runners, [32] and they must do so for hours at a time since the Olympic events are the 20 km (12 mi) race walk (men and women) and 50 km (31 mi) race walk (men only), and 50-mile (80 km) events are ...

3. Road running - Wikipedia

   en.wikipedia.org/wiki/Road_running

   Although running can seem like a very cheap activity that anyone can partake in, there are some expenses. Replacing running shoes every 400–500 miles (650–800 km) costs money. [14] [It was 300 to 400 miles earlier in the article.] Also, road race entry fees can be expensive because they have to cover the costs incurred by the race organizer ...

4. California Trail - Wikipedia

   en.wikipedia.org/wiki/California_Trail

   This was the last water before crossing about 45 miles (72 km) of desert consisting of soft dry soil that rose in suffocating clouds [72] before reaching the next water at the Green River about 4 miles (6.4 km) below the present town of La Barge, Wyoming. Here, the Green cut a steep 400 feet (120 m) channel through the Green River Desert, which ...

5. 4 × 100 metres relay - Wikipedia

   en.wikipedia.org/wiki/4_×_100_metres_relay

   If on the European continent the metric system is the one almost exclusively used (4 × 100 metres, or a lap of 400 m), where the imperial system is still used (UK, USA and Australia, mainly) this relay was rather ran over the distance of 4 × 110 yards, a total of 402.34 m, and that, until the late 1960s.

6. Radiation effects from the Fukushima Daiichi nuclear disaster

   en.wikipedia.org/wiki/Radiation_effects_from_the...

   On 16 March Japan's ministry of science measured radiation levels of up to 330 μSv/h 20 kilometers northwest of the power plant. [194] At some locations around 30 km from the Fukushima plant, the dose rates rose significantly in 24 hours on 16–17 March: in one location from 80 to 170 μSv/h and in another from 26 to 95 μSv/h.

7. Philadelphia - Wikipedia

   en.wikipedia.org/wiki/Philadelphia

   The city encompasses 142.71 square miles (369.62 km 2), of which 134.18 square miles (347.52 km 2) is land and 8.53 square miles (22.09 km 2), or 6%, is water. [79] Natural bodies of water include the Delaware and Schuylkill rivers, lakes in Franklin Delano Roosevelt Park , and Cobbs , Wissahickon , and Pennypack creeks.