'Sugar and spice and all things nice. That's what little girls are made of...' So goes the old playground rhyme, along with its equally sexist counterpart, 'Slugs and snails and puppy dog tails, that's what little boys are made of.' But as anyone with even an intermediate qualification in human biology will confirm, this is wildly inaccurate. This week's challenges and opportunities alike help you to discover what you are really made of. You will soon see the most undeniable evidence that you are made of the right stuff.