Explain the similarities and differences between pigeonholing a bill and exercising a pocket veto.

In the U.S system, the President was ten days to decide what to do with a bill passed by  Congress. If he signs it, it becomes a law. If he vetoes it, it goes back to Congress, which can override the President's decision and still make it a law if two thirds of both houses agree. But if the ten days goes by, the President hasn't make any with the bill and the Congress adjourns before the ten days is up, the bill is vetoed and cannot go back to Congress, so the President can't be overrode.

A pigeonhole is when a bill is put aside for a better time to pass it or to kill it.

the captain of a steam ship naturally chooses the shortest route to his destination. since a sailing ship is usually pushed by winds and currents, its captain must find a route where the wind will probably blow in the right direction. tacking, i.e. using contrary wind to pull (sic) the sails, was always possible but wasted time because of the zigzagging required, and this would significantly delay long voyages. the early european explorers were not only looking for new lands. they also had to discover the pattern of winds and currents that would carry them where they wanted to go. during the age of sail winds and currents determined trade routes and therefore influenced european imperialism and modern political geography. for an outline to the main wind systems see global wind patterns.

pilotage or cabotage, in one sense, is the art of sailing along the coast using known landmarks. navigation, in one sense, is the art of sailing long distances out of sight of land.[1] although the polynesians were able to sail the pacific (with great difficulty) and people regularly sailed north and south across the mediterranean, before the time of columbus nearly all sailing was coastal pilotage

        it is some were in here? ///

2018 means 2018 ce or common era

there have been other eras too including bce, which included way more years.