Sweating is extremely efficient at cooling humans down. It works by causing liquid to come out of a person's pores. When the liquid evaporates, the person's body starts to cool down.
Snakes don't help humans..but they are useful for entertainment..but are dangerous.
its not useful for the refrigerator its useful for humans only....
No. tapeworms are pest to humans.
anemometer
its not useful for the refrigerator its useful for humans only....
output device
For example a thermometer.
they damage the wetlands which are useful for humans.
Matt Knight:P
nothing
it is booger pies
yes