世界上最繁(@:忙的城市

　　More than (half o# f us now _live in cit# ies. $
Crowded [, ;# chaotic and b,:u,-[=rs_)ting wit?!h )#^+l?ife - th#,:ese are, places under +-;pressure. In ?=th+is bra- n^+d $(new series#, Dan % Snow, :.Anita[:+ Rani* and =A de ]Adepitan ;[go_  -behind t$@) he scenes to !=\reveal the h #!idden sys_tem_^s a(%nd ar[,mies of
 people ru=nn-/ing#?_( some of the*? greatest citie^s `on earth. Find ou(+t- how M\$exico City keeps its in`habit[=a!; nts safe from ea)/rthqu/akes, and meet local peopl!e) who o/:ffer an i^n@] `side loo
! k at life in me ! t,[ropol\ise$s \/like Delhi and Ho_n\*\g. Kong. Mean?`w[:;hile, Moscow's incredible architec:ture :show.#s that the wo#*r_%\ld' ^s busiest c+;ities also hav?e --some of t/he rich\est his+t= ories.