Why is Israel so big in high tech?

A plug for "Start-up Nation" is mandatory, would be useful for anyone who wants a little deeper exploration of the topic: http://www.amazon.com/Start-up-Nation-Israels-Economic-Mirac...

Interesting point on number one. There is a big movement against the free movement of labor in the tech world, but that free movement of people is the life blood of high tech companies.