Further strikes, protests, a mailbomb and the military

All of this, for the most part, is perfectly normal and everyone takes it in stride: buying tickets for a concert, I walked past several protests -- one appeared to be about jobs, another had Ahmadinejad and Papandreiou in a photo -- and the military/national guard drilling in the National Gardens. There was a mailbomb that went off in Pangrati, the neighborhood where I live, injuring the mailcarrier. The newspapers pointed out that leftist groups send those to people once in a while. And all of this is normal, and people keep carrying on, and I can't figure out if everyone's nervous stoicism causes this atmosphere or is caused by it. Police in riot gear, chanting protesters, and mailbombs all have the threat of violence, but the worry caused by that is pushed back into my head because, again, it is normal, actual violence is there, but I stillw alk around with my muscles a bit tighter, and a bit more on edge, than I normally would.