Did you know that an elephant seal can hold its breath for two hours, the longest of any animal? Also, here are this weekend's subway changes.

1 trains will not run in either direction between 14 St and South Ferry from 11:30 p.m. Friday to 5 a.m. Monday. On the Van Cortlandt Park-242 St track, trains run express from Times Sq-42 St to 72 St; that change is in effect from 11:45 p.m. Friday to 5 a.m. Monday.

Wakefield-241 St bound 2 trains run express from Chambers St to 14 St and express from Times Sq-42 St to 72 St from 11:45 p.m. Friday to 6:30 a.m. Sunday, and again from 11:45 p.m. Sunday to 5 a.m. Monday. Trains on that track will also run express from Franklin Av to Atlantic Av-Barclays Ctr, with that change in effect from 11:45 p.m. Friday to 5 a.m. Monday, and trains on that track will run loal from 14 St to Penn Station from 11:30 p.m. Friday to 5 a.m. Monday. During that period, Flatbush Av-Brooklyn College bound 2 trains will run local from Penn Station to Chambers St.

Harlem-148 St bound 3 trains will run express from Franklin Av to Atlantic-Av Barclays Ctr and local from 14 St to Penn Station, with that change in effect from 6:30 a.m. to midnight on Saturday and Sunday. During that period, New Lots Av-bound trains will run local from Penn Station to Chambers St.

4 trains will not run at all between 149 St-Grand Concourse and Woodlawn from 11:30 p.m. Friday to 1 a.m. Monday. Trains will operate between New Lots Av/Crown Hts-Utica Av and 149 St-Grand Concourse, and then reroute along the 2 to and from E 180 St during that period. Manhattan-bound trains will run express from Franklin Av to Atlantic Av-Barclays Ctr from 11:45 p.m. to 7:30 a.m. Friday to Sunday, and then again from 11:45 p.m. Sunday to 5 a.m. Monday. Also on that track, trains run local between 42 St and 125 St from 12:01 a.m. Saturday to 5 a.m. Monday.

5 trains will not run in either direction between Eastchester-Dyre Av and Flatbush Av-Brooklyn College, with that change in effect from 11:30 p.m. Friday to 5 a.m. Monday.

All 7 trains are suspended between 34 St-Hudson Yards and Queensboro Plaza from 12:15 a.m. Saturday to 4:30 a.m. Monday. Main St-bound trains will run express from Queensboro Plaza to 74 St-Broadway during that period.

All A trains will reroute along the F line between W 4 St-Wash Sq and Jay St-MetroTech from 11:45 p.m. Friday to 5 a.m. Monday. Trains will stop at 155 St and 163 St from 12:01 a.m. Saturday to 4:30 a.m. Monday.

All C trains will reroute along the F line between W 4 St-Wash Sq and Jay St-MetroTech from 6:30 a.m. to 11 p.m. on Saturday and Sunday. Also during that period, trains will not run at all between 145 St and 168 St.

Coney Island-Stillwell Av bound D trains will make local stops from DeKalb Av to 36 St from 12:01 a.m. Saturday to 5 a.m. Monday.

F trains will not run in either direction between Coney Island-Stillwell Av and Church Av from 11;45 p.m. Friday to 5 a.m. Monday. Also during that period, Jamaica-179 St bound trains will skip 75 Av, Briarwood, and Sutphin Blvd.

M trains will not run in either direction between Metropolitan Av and Myrtle Av, with that change in effect from 11:45 p.m. Friday to 5 a.m. Monday. Trains will operated between Essex St and Myrtle Av, and reroute along the J line from Broadway Junction except for late nights.

Coney Island-Stillwell Av bound N trains will make express stops from Atlantic Av-Barclays Ctr to 59 St from 11:45 p.m. to 6:30 a.m. Friday to Sunday, and again from 11:45 p.m. Sunday to 5 a.m. Monday.

Bay Ridge-bound R trains will will make express stops from Atlantic Av-Barclays Ctr to 59 St from 11:45 p.m. Friday to 5 a.m. Monday.

The 42 St S shuttle will operate overnight all weekend.

W service will operate between Whitehall St and Ditmars Blvd, with that change in effect from 7 a.m. to 9 p.m. Saturday and from 9 a.m. to 7 p.m. Sunday.