○○○ underfloor ⪢⪢
As hard as this might be to believe, the Romans had underfloor heating in their homes 2000 years ago.
http://qindex.info/i.php?x=11831

○○○ gap ⪢⪢
Later hypocausts also included gaps between the walls so heat could flow throughout the house.
http://qindex.info/i.php?x=11839

○○○ light ⪢⪢
It is made when matter is heated up or gains energy.
http://qindex.info/i.php?x=16150

○○○ warhead ⪢⪢
It is capable of destroying any existing main battle tanks in the world as the Javelin's heat war head is capable of defeating modern tanks by hitting them from above where their armor is the thinnest. #bookmark
http://qindex.info/i.php?x=20363

○○○ put on ⪢⪢
the heat┆the air conditioning┆the fan
http://qindex.info/i.php?x=29148

○○○ supply ⪢⪢
The water heater _____ the house with warm water.
http://qindex.info/i.php?x=31464

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