Beware of what may appear to be drops of water on benches. They may be corrosive liquids. Use the fume hood for strongly smelling chemicals, acids, etc. Always waft odors toward your nose with your hand. Never breathe them directly.
Mercury vapors are highly toxic.
Never handle mercury with your hands. It will also ruin gold and silver jewelry on contact. Never use cracked or broken glassware. Exchange it at the store. Sweep up all broken glass immediately and place in the container for broken glass.