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.
A steady red light marks the port (left) side of a boat; a steady green light marks the starboard (right). White lights are masthead lights or stern lights on the back of the boat. They make the boat visible at night. A steady yellow light marks the stern (back) of a tug pushing barges. The position of the lights on a boat has significance. Large ships have white lights on two masts. The forward mast light is the lower of the two white lights, making it possible to tell which way a ship is moving. Law. The size, type, color and visibility of a ship's colored lights is dictated by the U.S. Coast Guard Navigation Rules.