England has the Tate Modern, which has an exhibition with giant five-story slides.

I saw this on TV! Did you get to slide?

What are the clinical definitions of addiction and compulsion, et al? Can I have an addiction that doesn't have a detrimental effect on my life? Can I have an addiction that has a beneficial effect?

I'm not sure where this came up in reading or discussing OCD, but I have been exposed to the point of view that as long as it doesn't get in the way of day to day functioning, why treat it?

I saw this on TV! Did you get to slide?

Frankly, the slides were a little narrow, and I figured that it would not to be good to get halfway down and then figure out that my hips didn't fit through. I did take pictures and video of other people on the slides. It was mostly kids. I'll try to remember to post those at some point.

Oh, SLIDES!

I thought you meant GIANT photo-transparencies.

Oh, you didn't slide! I'm all disappointed virtually! But pictures would be good.

I hope the remainder of your trip was fun and safe and there was no driving the wrong way on any one-way streets.

Swarm, swarm!

A "swarm" of simple-minded robots that teams up to move an object too heavy for them to manage individually has been demonstrated by robotics researchers.

The robots cannot communicate and must act only on what they can see around them. They follow simple rules to fulfil their task - mimicking the way insects work together in a swarm.

"In the object transport scenario they search for a red object and grasp onto it," explains Dorigo. "When they do that they also change colour from blue to red." This means a cluster of bots is "connected" to the object. When the bots cannot see any more blue - meaning they are all linked together - they start dragging the object towards its target.

The robots can adjust their caterpillar tracks, to ensure they are all pulling in the right direction. "Each robot has a traction sensor inside that detects all the external forces on it," explains Dorigo. A robot uses its sensor to identify any conflicting forces, and then changes direction accordingly.

Dorigo is now working on a swarm of robots that could operate in a human environment. "It is called Swarmanoid and will have three different kinds of robots," he explains. Some robots will be able to crawl along like Swarm-bots, others will be able to climb walls, and others still will be able to fly, he says.

Some robots will be able to crawl along like Swarm-bots, others will be able to climb walls, and others still will be able to fly, he says.

And then they'll take over the world and dispose of humanity?

And then they'll take over the world and dispose of humanity?

Only if their good/evil switches are accidentally set to evil.

I, for one, welcome our new Swarm-bot overlords.

I thought you meant GIANT photo-transparencies.

I did, too.