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Unit1FogFogwarningWhenPollylefthomethatmorning,thecitywasalreadycoveredinagreymist.Atlunch,theradioforecastthatthemistwouldbecomeathickfogintheafternoon.Atfouro'clock,Pollyleftworkandsteppedoutintothefog.Shewonderedifthebuseswouldstillberunning.NobusestoKingStreetOnceoutinthestreet,shewalkedquicklytowardsherusualbusstop.‘Howfarareyougoing?’thebusconductoraskedherbeforehetookherfare.‘KingStreet.’saidPolly.‘Sorry，Miss’repliedtheman,‘thetruthisthatitistoofoggyforthebustorunthatfar.TaketheUndergroundtoGreenPark.Theweathermightbebetterthereandyoumightbeabletogetataxi.’AtallmanAsPollyobservedthepassengersonthetrain,shehadafeelingthatshewasbeingwatchedbyatallmaninadarkovercoat.AtlastthetrainarrivedatGreenParkstation.Whiletherestofthepassengersweregettingout,sheglancedatthefacesaroundher.Thetallmanwasnowheretobesoon.FootstepsWhenPollygottothestationentrance,itwasempty.Outside,wherevershelookedthefoglaylikeathick,greycloud.Therewasnooneinsight.PollysetofftowardsParkStreet.Assheheardaman’svoiceinherearsaying‘Sorry.’Themanmovedaway.Shecouldfeelherheartbeatingwithfear.ThehelpfulstrangerThensheheardthesoundagain-softfootstepsbehindher.Aminutebefore,shehadwishedforsomeonetocomealong.Nowshewantedtorun,butfearheldherstill.Thefootstepsseemedclosenow.Thenaman’svoicecameoutofthedarkness.‘Isanybodythere?’Pollyhesitated.Atlastsheanswered,‘Hello,IthinkI’mlost.’Afewsecondslater,ahandreachedoutandgraspedherarm.Pollyfoundherselfstaringupatthefaceofanoldmanwithabeard.‘MaybeIcanhelpyou.Whichroaddoyouwant?’heasked.‘Iliveat86KingStreet.’Pollyreplied.‘Justtakemyhand.’saidtheman.‘Comewithme.You’llbeallright.’HetookPolly’shand.‘Watchoutforthestephere.’Inhisotherhandthemancarriedastick.Pollyheardithitthestep.‘Icanremembersometerriblefogs,butmaybethatwasbeforeyourtime.Ican’tseeyourface,butyousoundyoung.Howoldareyou?’‘Justtwenty.’answeredPolly.‘Ah,twenty!Aniceagetobe.Iwasyoungonce.Nowwe’reatthecrossroads.Turnlefthere.’‘I’mquitelostnow.Areyousureyouknowtheway?’Pollywasbeginningtofeelfrightenedagain.’‘Ofcourse.Youreallyshouldn’tfeelanxious,’Heheldherhandmorefirmly.Thegratefulhelper‘Hereweare.KingStreet.’Hestopped.‘Thankyousomuchforcomingtomyaid.’saidPollyinrelief.‘Wouldyouliketocomeinandrestforawhile?’‘It’sveryniceofyou.’saidtheman,‘butI’llbeoff.Theremaybemorepeoplelosttoday,andI’dliketohelpthem.Yousee,afogthisbadisrare.Itgivesmethechancetopaybackthehelpthatpeoplegivemewhenit’ssunny.Ablindpersonlikemecan’tgetacrosstheroadwithouthelp,exceptinafoglikethis.’P18ProjectSharkattacksTherearenearly400differenttypesofsharks,butonlyabout30typesareknowntohaveattackedhumanbeings.Manypeopleknowthatthemostdangeroussharkisthegreatwhiteshark,probablybecausetheyhaveseenthefilmJaws.However,twoothersharksarealsoratherdangerous:thetigersharkandthebullshark.Contrarytowhatmanypeoplemightassume,evidenceshowsthatsharksseldomattackhumans.Therearethreetypesofsharkattacks.Inthemaintype,thesharkattacksyoubecauseitmistakesyouforafish,butwhenittasteshumanfleshitdecidestogiveupandswimsaway.Inthesecondtype,thesharkpushesyouwithitsnosetofindoutifyouarefittobeeaten,andthenbitesyouifitthinksyouare.Inthethirdtype,thesharkwaitsforyoutoswimby,andthenattacksyousuddenly.Thelasttwotypesofattackmoreoftenresultinthedeathofhumans.Toreducetheriskofasharkattack,youshouldfollowthesesuggestions.Donotswiminthedark.Sharkscanstillseeyoubutyoucannotseethem.Donotgoswimmingintheoceanifyouhaveafreshwound.Sharkscansmellbloodoveralongdistance.Donotwearbrightclothingorjewellery,becausesharksareattractedtotheflashof,coloursandbrightobjects.Stayingroups,assharksusuallyavoidlargenumbersofpeople.Recently,sharkattackshavebeenincreasingaswatersportsarebecomingmorepopular.Ifasharkattacksyou,followtheadvicebelow.Keepcalm.Donotpanic.Hitthesharkonthenosewithyourfist.Stickyourfingerintheshark'seye.Don'tbefrightenedbysharks:youare3otimesmorelikelytobehitbylightningthanbeattackedbyashark.ThewonderfulworldofpigeonsItisnight.Allisquiet.Thesoldiersareasleepwhileaguardwatchesfortheenemy.Thereisaflash,andthesoundofguns!Theyarebeingattacked!Hundredsofenemysoldiersrushtowardsthem.Theyareallgoingtobekilledunlesstheygethelp.Whatshouldtheydo?Anofficerwritesashortmessagequicklyonasmallpieceofpaper:'Beingattacked!Hurry!'Herollsupthepaperandputsitintoasmallcase,andthenreachesintoacageandgetsabird.Attachingthemessagetoitsleg,hesetsthebirdloose.Itimmediatelyfliesintotheairanddisappearsinthedark.Willthebirdarriveintime?Willtheybesaved?Thoughitmayseemhardtobelieve,thebirdtheofficerusesisthesamebirdoftenseeninpublicparks--thepigeon.Pigeonshaveawonderfulsenseofdirectionandcanfindtheirwayhomeoverlongdistances.Indeed,pigeonshavebeenknowntoflyhomefromasfarawayas1,800kilometres.Thatiswhypigeonshavebeenusedsinceancienttimestocarrythenewsoreventhemail.However,itwasinwarthattheyfoundtheirgreatestuse.DuringbothWorldWarIandII,pigeonswereemployedbyarmiestocarrymessagestoandfromthefrontlines,savingthelivesofmanysoldiersandevenhelpingwinsomeimportantvictories.Howdopigeonsfindtheirway?Pigeonsappeartohaveacompassinsidethemthattellsthemwhichwayis