People who stop smoking between the ages of 45 and 54 reduce their risk of dying prematurely by approximately percent.

The higher you go up the less oxygen there is 

Yes yes yes very good

A  reaction  in which  energy  is  released  to the surroundings is called an exothermic  reaction. in this type of  reaction  the enthalpy, or stored  chemical energy, is lower for the products than the reactants. when ammonium nitrate is dissolved in water,  energyis  absorbed  and the water cools.

The sun is 432,170 mi big!