UK Issues High-tech Stamps

bgood writes: "According to this story on Excite@Home, the UK's Royal Mail has released a series of "interactive" stamps. Included in the series: A scratch-and-sniff stamp, a stamp with a hologram, and another that shows an electrically-charged particle when warmed by finger heat. The stamps commemorate 100 years of the Nobel Prize and Britain's achievements. The Royal Mail describes the stamps here."