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13.M3U1.Reading—FogFogwarningWhenPollylefthomethatmorning,thecitywasalreadycoveredinagreymist.Atlunch,theradioforecastthatthemistwouldbecomeathickfogintheafternoon.Atfouro’clock,Pollyleftworkandsteppedoutintothefog.Shewonderedifthebuseswouldstillberunning.NobusestoKingStreetOnceoutinthestreet,shewalkedquicklytowardsherusualbusstop.‘Howfarareyougoing?’thebusconductoraskedherbeforehetookherfare.‘KingStreet,’saidPolly.‘Sorry,Miss,’repliedtheman,‘thetruthisthatitistoofoggyforthebustorunthatfar.TaketheUndergroundtoGreenPark.Theweathermightbebetterthereandyoumightbeabletogetataxi.’AtallmanAsPollyobservedthepassengersonthetrain,shehadafeelingthatshewasbeingwatchedbyatallmaninadarkovercoat.AtlastthetrainarrivedatGreenParkstation.Whiletherestofthepassengersweregettingout,sheglancedatthefacesaroundher.Thetallmanwasnowheretobeseen.FootstepsWhenPollygottothestationentrance,itwasempty.Outside,wherevershelookedthefoglaylikeathick,greycloud.Therewasnooneinsight.PollysetofftowardsParkStreet.Asshewalkedalongthenarrowstreet,sheheardthesoundoffootstepsapproaching,butbythetimeshereachedthecornerofthestreet,thefootstepsweregone.SuddenlyPollyfeltaroughhandbrushhercheek,andsheheardaman’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,’Polyreplied.‘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.’14.M3U1.Project(1)—SharkattacksTherearenearly400differenttypesofsharks,butonlyabout30typesareknowntohaveattackedhumanbeings.Manypeopleknowthatthemostdangeroussharkisthegreatwhiteshark,mainlybecausetheyhaveseenthemovieJaws.However,twoothersharksarealsoratherdangerous:thetigersharkandthebullshark.Contrarytowhatmanypeoplemightassume,evidenceshowsthatsharksseldomattackhumans.Therearethreetypesofsharkattacks.Inthemaintype,thesharkattacksyoubecauseitmistakesyouforafish,butwhenittasteshumanfleshitdecidestogiveupandswimaway.Inthesecondtype,thesharkpushesyouwithitsnosetofindoutifyouarefittobeeaten,andthenbitesyouifitthinksyouare.Inthethirdtype,thesharkwaitsforyoutoswimby,andthenattacksyousuddenly.Thelasttwotypesofattackmoreoftenresultinthedeathofhumans.Toreducetheriskofasharkattack,youshouldfollowthesesuggestions.Donotswiminthedark.Sharkscanstillseeyoubutyoucannotseethem.Donotgoswimmingintheoceanifyouhaveafreshwound.Sharkscansmellbloodoveralongdistance.Donotwearbrightclothingorjewellery,becausesharksareattractedtotheflashofcolorsandbrightobjects.Stayingroups,assharksusuallyavoidlargenumbersofpeople.Recently,sharkattackshavebeenincreasingaswatersportsarebecomingmorepopular.Ifasharkattacksyou,followtheadvicebelow.Keepcalm.Donotpanic.Hitthesharkonthenosewithyourfist.Stickyourfingerintheshark'seye.Don'tbefrightenedbysharks:youare30timesmorelikelytobehitbylightningthanbeattackedbyashark.15.M3U1.Project(2)—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,p