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2. McClellan–Kerr Arkansas River Navigation System - Wikipedia

   en.wikipedia.org/wiki/McClellan–Kerr_Arkansas...

   A map of the McClellan–Kerr Arkansas River Navigation System. The McClellan–Kerr Arkansas River Navigation System (MKARNS) is part of the United States inland waterway system originating at the Tulsa Port of Catoosa and running southeast through Oklahoma and Arkansas to the Mississippi River. The total length of the system is 445 miles (716 ...

3. Four-eyed fish - Wikipedia

   en.wikipedia.org/wiki/Four-eyed_fish

   Four-eyed fish. The four-eyed fishes are a genus, Anableps, of fishes in the family Anablepidae. They have eyes raised above the top of the head and divided in two different parts, so that they can see below and above the water surface at the same time. The optomotor response or OMR has been used as a test to investigate potential differential ...

4. Lock (water navigation) - Wikipedia

   en.wikipedia.org/wiki/Lock_(water_navigation)

   A plan and side view of a generic, empty canal lock. A lock chamber separated from the rest of the canal by an upper pair and a lower pair of mitre gates.The gates in each pair close against each other at an 18° angle to approximate an arch against the water pressure on the "upstream" side of the gates when the water level on the "downstream" side is lower.

5. AOL Mail

   mail.aol.com

   You can find instant answers on our AOL Mail help page. Should you need additional assistance we have experts available around the clock at 800-730-2563.

6. List of IOC country codes - Wikipedia

   en.wikipedia.org/wiki/List_of_IOC_country_codes

   Used in the IOC's medal database to identify medals won by mixed teams of athletes from multiple nations (such as the combination of France and Great Britain), a situation that happened several times in the Games of 1896, 1900, and 1904. Until 2021, the IOC used the code ZZX for mixed teams.

7. Fish doorbell - Wikipedia

   en.wikipedia.org/wiki/Fish_doorbell

   A fish doorbell (Dutch: visdeurbel) is a system that allows fish to pass through a closed sluice gate through crowdsourced input when fish are present. The Utrecht Visdeurbel uses a livestreamed underwater camera that allows users to press a doorbell button to notify the lock operator that there are fish swimming in the gracht, and that the lock should be opened. [1]