This week, we find out how a giant parachute could help avoid satellite collisions, why the schizophrenic brain can't see a popular optical illusion and discover that all octopodes (or octopuses?) are poisonous! Plus, we take on your science questions, discussing cycling on the moon, electric fences and couples getting tazered together. In Kitchen Science, we make a sprinkler from a spinning straw! Like this podcast? Please help us by supporting the Naked Scientists