Thecontrolsofmostmodernairplanescanbeoperatedeithermanuallyorautomatically.
A、bythebookPeoplewhodonotsleepenoughtendtobecomeirritable.
Incalculatingthedailycalorierequirementsforanindividual,variationsinbodysize,physicalactivity,andageshouldbetakenintoaccount.
AlthoughtheCarbon14methodofdatingoldobjectsisnotfoolproof,itisthebestmethodavailableatpresent
Solidgeometryhasenabledastronomerstocalculatethepositionsoftheheavenlybodiesrelativetooneanother.
Someanimalspantandsweattospeedevaporationofbodymoistureandthuscoolthemselves.
