Chocolates, flowers and helium-filled metallic balloons are popular Valentine’s Day gifts. Hold tight to those balloons on Feb. 14, though, as they can be a headache for energy companies.

Chef Grant Achatz serves up some very unusual dishes, and one of the most popular is an edible helium balloon. Customers are served the balloons and encouraged to suck in the helium before eating it.

A Pulsar Helium drill site as seen Jan. 13 near Babbitt, Minn. Canada-based Pulsar Helium has discovered extremely high concentrations of helium in tests of underground deposits. Helium is best ...