So you know, formally, what the government here is saying is that Israel's prime minister announced the appointment on Twitter. He didn't follow diplomatic protocol. But what we know is that it's about much more than that. It is about who Dani Dayan is.

Israel is a big provider of military technology to Brazil and this has caused a big breach in the two sides of the government. On the one hand, you have the diplomatic side. On the other side, Brazil's military has been quoted in the local press as being quite upset that this diplomatic standoff could affect the military relationship.

Rigorous teaching schedules combined with mounds of paperwork can lead to burnout.

Iranians also see external reasons for caution. Analyst Foad Izadi at Tehran University says Iranians only need to look at the chaos plaguing the region to see how easily popular demands for change can get out of hand.

So you know, formally, what the government here is saying is that Israel's prime minister announced the appointment on Twitter. He didn't follow diplomatic protocol. But what we know is that it's about much more than that. It is about who Dani Dayan is.

Sanaz Minaei [business woman] shows a visitor a cooking class at one of her several companies and says the opportunities for Iran are huge if only the country can rejoin the global economy as promised.

He is someone who is involved in the Israeli-Palestinian conflict in a fundamental way. Let's start with who Dani Dayan is. He was the former head of one of the main settler councils, the Yesha Council, which is a kind of umbrella organization for settlements in the occupied West Bank. Now, you know, for some countries this might not be an issue, but Brazil has made a point of its policies on the Israeli-Palestinian issue.