Did you know...? MERCAPTAN.   

Natural gas and propane are colorless and odorless. The March 18, 1937 Texas School Explosion led to the law requiring Mercaptan to be added to natural gas as a warning odor.  

Other recommendations of the 1937 Court of Inquiry still needed in most schools:

1) technically trained administrators for modern school systems,

2) regular inspections and more widespread public education about managing hazards,

3) a comprehensive, rational safety code.

You can prevent explosions in your school.