Here's the line-up for Tech Podcast 175: first, a website that allows you to donate grains of rice while taking a vocabulary quiz. Then, two reports on Skype. The first looks at how language teachers, and learners, are connecting via voice-over-internet. The second looks at why Germany wants to crack Skype's encryption, but can't. Then, we stay in Germany to hear about how paying by fingerprint is catching on. And we finish with an extended interview with Noah Shachtman about his recent article on how social networking is replacing electronic networking in Iraq.