The basic principle is that the highly-ordered molecules on which the chromosomes are mounted are birefringent (they change the polarization-state of light), so if you know what the original polarization state was and if you can measure the state afterwards, then you can detect those molecules, even though they are transparent. As the BBC article says, this means you don't need to use toxic dyes to find them (which is obviously a bad idea, if you want the egg to actually survive the process).

"On the downside, Nokia has given the 6820 a mere 3.5 MB of internal shared memory, which some business professionals may find insufficient for storing all their e-mails, text and multimedia messages, ring tones, images, video clips, calendar notes and "to-do" lists -- not to mention any of the available Java Latest News about Java applications that they may want to download to the device."

Yes. For my "business". You just keep telling yourself that you are not a phone fashion geek but a "business professional" and maybe, if you wish hard enough, it will come true!