The next night it's four vampires and six humans, then eight vampires and two humans.

NPR: So, What Actually Is 'Mathematically Impossible'?

Many firms, hoping to get broad marketing claims for their drugs, doomed themselves by testing their compounds in humans six or more hours after stroke onset, even though the drugs had worked only within a two-hour window in animal tests.

FORBES: Brain Repair

In 1995 Biogen began clinical trials of Amevive, ultimately testing it in 1, 300 humans over six years.

FORBES: Skin Deep

Testing the vaccine in ferrets before moving on to humans will take six to eight weeks, eliminating any head start over the traditional egg method.

FORBES: Broken Eggs

In terms of what makes us human, the most promising areas for exploration are six regions that show very little variation among humans but more variation in chimps suggesting they were important in the human line of evolution.

BBC: NEWS | Science/Nature | Reading the chimp book of life

If humans really are hardwired to home in on six focal colours, then all languages should assign words around those six.

ECONOMIST: Psychology

And this is really significant because if we were a great ape, we would spend about six hours a day just chewing our food, and as it is, we spend, all humans, less than an hour a day.

NPR: Scientist: Cooking Sets Us Apart From Apes