Yes they are although they "claim" to have eradicated many of the fundamentalist in their midsts. Their website is here (http://www.kkklan.com/) should you wish to do further research.

Rainbows are caused by the refraction of light through water and the splitting of the visual spectrum. Since this spectrum is a constant and conditions that create a rainbow are also fairly consistent you always see the same (all) representation of the spectrum. You can see a similar effect if you look up splitting a light via a prism.

Zorbing is basically getting inside a massive inflatable ball and rolling down hills. I have never done it myself but it looks loads of fun.

Hulk, he is the strongest there is!

Tsunamis or tidal wives are caused when tectonic plates collide (an earthquake) out at sea. Because there is tons of water above the epicenter of the earthquake it absorbs the kenteic energy and builds up waves going out in all directions. Some of these will disappear after a while but other hit land before this happens.