Spiders, Space and Skyscrapers

How strong is spider silk? Why are some people scared of spiders? How vast is space and does it have an end? How are skyscrapers built? We answer these question in this week's show. We also discuss swine flu, investigate how good aluminium is as a lining material, uncover what causes allergies to cats, work out the speed of heat and electricity and reveal if it's possible to reverse gravity!