The average lifespan of a friendship? 10 years. Here’s why.

This is the psychology of why friendships (and marriages) fail.

  • Some friendships last a lifetime, but most have a lifespan. In the U.S., best friends tend to last for 10 years on average, says Nicholas Christakis.
  • In friendships, one person may begin to defect or "free ride", which causes the other person to choose between cooperation or defection. People tend to choose the latter so they won't be taken advantage of.
  • A certain amount of social fluidity, taking a breather from a friendship, can actually make a friendship last longer.

Porn arouses women and men in same neuronal way, review finds

The results contradict the popular assumption that men react far more strongly to pornography.

Pixabay
Sex & Relationships
  • The review examined the results of 61 brain-scanning studies that involved 1,850 people.
  • The results of the review found no significant differences in how male and female brains respond to viewing visual erotic stimuli.
  • Still, one of the researchers noted that there are sex-specific differences in sexual behavior.
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NASA releases stunning image of ISS crossing in front of the sun

Strangely, the sun showed no sunspots at the time the photo was taken.

Image source: Rainee Colacurcio
Surprising Science
  • The photo shows the International Space Station as it orbits the Earth, as it does every 90 minutes.
  • The photo is remarkable because it offers a glimpse of the star at a time when there were no sunspots.
  • In November, astronauts aboard the ISS plan to grow Española chili pepper plants.
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Belly fat: Gut bacteria checks could lead to personalized diets

The reason one diet does not suit all may be found in our guts.

Media for Medical / Getty Images
Surprising Science
  • New research shows that there's no one diet that works for everyone.
  • Instead, gut bacteria may hold the key to personalized diet plans.
  • A future doctor may check gut bacteria to offer diet advice.
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