a riddle then

what walks, can’t fly

leaves a mountain,

fans in summer,

grasps at straws,

enough teeth for 88

and padded soles.

and now, for the hard one:

my friend Bob is a butcher,

his shoe size is 47 and he is 6ft6′ tall.

what does he weigh?

what resource is infinite in quantity,

guarded by the wise,

wasted by the young,

killed at the airport,

saved by a calculator?