Brittany Hu is so determined to be famous, she's prepared to ride the Gravity Buster for twelve hours straight! But by the time she and her brother Lukas have reversed gravity, invented rollerbuckets and taught emus to fly, becoming famous is the least of their problems.

FIVE PROBLEMS WITH BEING DE-GRAVITISED: Sunburn on the soles of your feet Ceiling fans Spaghetti goes up your nose You can't go outside unless you're on a leash Everything looks upside down

Click here to read an extract from 'The Upside-Down Girl'