Over the Hooghly River stands an iconic cantilever truss bridge that uses a surprising number of nuts and bolts. How many?

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How to find the answer: Search [Hooghly River truss bridge] to find that the bridge is called the Howrah Bridge (or Rebindra Setu) and is found in India. Search [Howrah Bridge nuts bolts] to learn it uses no nuts or bolts. It was built using nothing but rivets--there are zero bolts in the bridge!