Why propane has a higher boiling point than helium?

Is zircon ilmenite sillimanite tungsten found in beach sands of kerala? What is the difference of 0.5 mole and 0.5 M? Yersinia pestis gram stain? What is buffer margin? The three major scales used to measure earthquakes are Mercalli Scale Richter Scale and Magnitude Scale true or false? Do gymnosperms have ovaries? Why do paper clips sink? Why does DNA need to be expressed as 3 letter words rather than 4? When something you hope for really happens? What is the temperature scale that that measures absolute temperature created by Sir William Thomson? If you put a couple of worms in your plant pot will it eat the plant? What happens in oceanic oceanic convergent? What does your landform indicate about the region modeled? Will an EMP ruin batteries? What happens to a plant if its stomata stayed open all the time? What time do greenspoint mall open? What relays information to the muscles from the brain? What would be formed if one proton is added to the lithium atom? Who believed the exact location of electrons at a given instance to be uncertain? Uranium atomic number mass and number of protons?