Memorabilia
Science collectibles reveal their secrets in 2013 sales
An important sale from Christie's reminds Paul of the secrets of science collectibles
Celebrities take their hats off to homeless charity in eBay auction
A range of top celebrities have donated signed hats to raise funds for the homeless
Collectors can satisfy their thirst for 'True Blood' in charity eBay auction
Stars Stephen Moyer and Alexander Skarsg�rd are selling signed memorabilia for a good cause