As any student who's had to study for multiple exams can tell you, trying to learn two different sets of facts one after another is challenging.
In 1992 Robin Dunbar famously proposed a rough estimate of 150. In 1998, the mean personal network size was of 290. And in 2010 we are now facing an average of 610 personal ties. So - who says more?
If you really must offend someone, wait until they are lying down: people handle anger differently when they're lying on their backs, compared with sitting upright.
Electrodes recorded brain activity while infants grabbed for toys. The same brain area showed activity whether infants grabbed for a toy themselves or watched an adult do the same.
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