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1、l.SaltWedonotknowwhenmenfisrtbegantousesalt.Butwedoknowthatithasbeenusedinmanydifferentwaysthrougholdhistory.Historicalevidentshows,forexample,thatpeoplewholivedover3000yearsagoatesaltedfish.ThousandsofyearsagoinEgypt,saltwasusedtopreservethedead.Stealingsaltwascons
2、ideredamajorcrimeduringsomeperiodsofhistory.In18thcenturyforinstance,ifapersonwasaccountstealingsalt,hecanbeputinjail.Historyrecordsthatabout10,000peoplewereputinjailduringthatcenturyforstealingsalt.About150yearsbefore,intheyear1553,takingmoresaltthanonewasallowedto
3、waspunishableasacrime,theoffendersearwascutoff.Saltwasanimportantitemonthetableofroyalty.Itwastraditionalyplacedinfrontofthekingwhenhesatdowntoeat.Importantguestsattheking'stablewillsitnearthesalt.Lessimportantguestwillbegivenaseatfartherawayfromit.2.PerceptionsAskt
4、hreepeopletolookoutofthesamewindowatabusystreetandtellyouwhattheysee.Probably,youwillreceivethreedifferentanswers-Eachpersonseesthesamething,buteachperceivesomethingdifferentaboutit.Perceivinggoesinourminds.Afterthreepeolewholookoutofthewindow.Onemaysaythatheseesapo
5、licemangivingadriveraticket.Anothermaysaythatheseesarush-hourtrafficjamatthestreetcorner.Thethirdmaytellyouthatheseesawomantryingtocrossthestreetwith4children.Forperception,isthemind'sinterpretation,ofwhatthesensesinthiscaseoureyestellus.Manypsychologiststodayarewor
6、kingtotrytoexplainjusthowapersonexperiencesorperceivestheworldaroundhim.Usingascientificmethod,thepsychologistssetupexperiments.Theyaretryingtofindoutwhatmakesdifferentpeopleperceivetotallydifferentthingsaboutthesamething.3.BalloonsBalloonshavebeenusedforsportforabo
7、ut100years.Therearetwokindsofsportballoons,gasandhot-air.Hot-airballoonsaresaferthangasballoons,whichmaycatchfire.Hot-airballoonsarepreferredbymostballoonistsintheUnitedStatesbecauseoftheirsafty.Theyarealsocheaperandeasiertomanagethangasballoons.Despitetheeaseofoper
8、atingaballoon,pilotsmustwatchtheweathercarefully.Sportballoonflightsarebestearlyinthemorningorlateintheafternoonwhenthewindislate.Overthey
