Tip: Take blink-free group photos

Yes, you wouldn't think it was possible to take a photo of a group without at least one person closing their eyes. But it is possible. In fact, there is a scientific formula to help you - it is based on the number of photos you need to take to make sure you get a good one (well 99% confident anyway). Beware ... when the group gets to over 50 it is close to impossible to get everyone with their eyes open.

Read CSIRO physicist Dr Piers Barnes' practically fail-proof method on the Velocity science in motion website.