The researchers do not yet understand the why mandrill societies have evolved as they have.
Biologists do not yet understand the widely varying qualities and distribution of human hair.
These mutant mitochondria could multiply during embryonic development to cause disease, perhaps in way we do not yet understand.
"It's surprising to most people that we, the human race, do not yet understand biological walking," he says.
Researchers do not yet understand why there are two systems, or how the body chooses whether to assign a damaged cell to senescence or to death.
The alternative hypothesis – that the world's oceans have been absorbing the heat in ways we do not yet understand – is ignored.
The baddies' grand plan: to kidnap Jim Coaver for reasons we do not yet understand - but were presumably contained on the laptop, before Sasha smashed it up.
Mr. McDonough and his friends do not yet understand that they are thoroughly qualified as expert marksman in the great sport of shooting their own feet.
Irish people are deeply afraid but do not yet understand the implications of decisions that have been taken in their name.
By 1350, however, for reasons that archeologists do not yet understand, the city had been abandoned forgotten so thoroughly that its original name is lost to history.
These childish Afghans, who adore our pop songs but do not yet understand our culture of freedom: thank goodness Jim has come to save them.
