An engineer, a biologist, and a statistician go deer hunting.
They see a buck, moving through the woods.
The engineer says, "I estimate his speed at .8 meters per second and his distance at 32 meters. Therefore, I need to lead him .4 meters." He shoots and misses ahead of the deer by 1 meter.
The biologist says, "That deer's browsing pattern leads me to believe he prefers fresh tree leaves over the grass shoots he's sniffing, and he's about to stop and reach up for that branch". He shoots and misses behind by 1 meter.