Why does the whole world measure its time and define its position in relation to the Greenwich Meridian, a line passing through a spot on the banks of the Thames in south-east London? The story begins with the invention in London of a sea-going clock that allowed sailors to find their longitude. The object pictured here is one of those clocks — a marine chronometer made around 1800 — which could keep perfect time even in rolling seas. –A History of the World in 100 Objects, Neil MacGregor How does the hook engage the reader in the rest of the paragraph? It gives the reader information about a previously unfamiliar topic. It makes the reader wonder how the chronometer relates to our notion of time. It makes the reader feel a personal connection to the inventor of the clock. It piques the reader’s interest in the bank of the Thames in southeast London.