P represents heating and Q represent cooling.
this is because when you start from a liquid and turn to a gas the particles move faster making them farther apart, causing a gas. the opposite happens when you go from a liquid to a solid. the partials move closer together causing a solid to form. :)
Past and light because it takes a minute for light to get from one place to another
Governments and NGOs assistant in economic development both domestically and internationally by supporting programs that help to lead economic development through activities such as job training, direct economic assistance, or other programs that seek to program economic development. These activities are traditionally done in conjunction internationally and domestically whereby governments help to fund NGOs that promote economic development.
I'd say everything can be used but only what is needed for particular patient.
