Eliza the Psychologist

Last week's question: Why do children like playing on swings and slides?

You know, even after spending some time looking on Google, I couldn't find a satisfactory answer to this question. If I may, however, I would like to propose the following partial solutions:

• Swings and slides both offer the kid motion, and it's faster motion than they at that age can acheive themselves. So it offers a novel sensation for the children.
• Along similar veins, at least the slide offers a new tactile experience as well. I can't think of that much else where you can feel solid material sliding underneath your fingers.
• Slides and swings are usually located in playgrounds, where lots of children gather. The opportunity to play with other children form the last part of the appeal.

Some adults (like me!) still go and play on slides and swings, and personally I think it's for much the same reason. Of course, as herion_e pointed out, there's also the nostalgia for us, too.

Building on the last point above, this week's question is: why do humans have social needs?