Pierre and Marie Curie are best known for their pioneering work in the study of radioactivity, which led to their discovery in 1898 of the elements radium and polonium.
1 The beam of your boat is the width at the widest part of the boat.  To measure the beam, stand inside the boat and run a measuring tape from the port (left) side to the starboard (right) side at the widest section of your boat.
Part of the bridge portion of the Chesapeake Bay Bridge-Tunnel is a truss bridge, in which triangular structures above or below the bridge deck provide support. A beam bridge is a bridge where the roadway simply sits on top of heavy beams. A highway overpass is one example.