Traditional IRA Withdrawal Rules With a Traditional, Rollover, SEP, or SIMPLE IRA, you make contributions on a pre-tax basis (if your income is under a certain level) and pay no taxes until you withdraw money. IRA withdrawal rules and penalty details vary depending on your age.
LPG (propane) smells because an odourant - Ethyl Mercaptan - is added to the gas to make it easier to detect a leak. In their natural state, LPG (Propane and Butane) and Natural Gas (Methane) are all odourless gases. The distinctive smell that people associate with these gases is actually added to them as a safety measure.
Making the world better, one answer at a time. The smell was put into natural Gas in the aftermath of a school explosion in New London Texas 1937. 300 students and faculty members lost their lives after the school exploded and was leveled when the trapped natural gas was ignited.   The School was being fueled by gas directly from the near by oil wells.