Destination Mars: this month we're launching a series of programmes to probe what it's going to take to send people to the Red Planet. We'll be looking at rocket technology, how to keep people fed and watered away from Earth and whether we really can hope to exist sustainably on Mars. This week we're focusing on the space pioneers who will take the first steps towards getting us there. Plus, in the news, four intestinal bacteria that can prevent asthma, a new magnetic material to protect you in car crashes, and a magic bullet to stop bleeding...