World War OneA war that included many European countries between 1914 and 1918.  began with the killing of one man, Archduke Franz FerdinandThe heir to the throne of Austria-Hungary. He was assassinated in Sarajevo in June 1914 aged 50, which led to the start of World War One. of Austria. In four years, 20 million people died.

No one wants a repeat. But last week, HamasA militant Palestinian organisation, which has controlled the Gaza Strip since 2007. It is listed as a terrorist organisation in the UK. leader Ismail Haniyeh was killed in IranA country in Western Asia, officially called the Islamic Republic of Iran. It has a population of 84 million. by a likely Israeli bombA weapon that explodes and is used to kill or hurt people or to damage buildings..

Iran has been left embarrassedFeeling ashamed or self-conscious. . Now, some think they will respond by attacking IsraelA country in the Middle East, and the only Jewish nation in the modern period. It is seen by Jews, Christians and Muslims as the Holy Land..

What might happen after that? Some worry that the rest of the world will be dragged in. The USA will help Israel. Russia will help Iran.

But will it happen? Many expertsSomeone who knows a lot about a particular subject. think it is unlikely.

The countries in the Middle EastThe lands around the east of the Mediterranean Sea and Arabia. know that war would be very hard. Iran will not want to risk being at war with the powerful Americans.

Israel knows that in a big war, the country's highly skilled workers would likely leave. Their economyThe way that money flows through a country, which affects wages and the cost of living. would suffer.

What is most likely to happen, experts say, is that Iran will respond to the attack - but not with such a big attack that Israel declares war. We will go on as before.

Are we panicking?

Yes! The world today is connected in so many ways. War would be bad for everybody. So there are lots of good reasons for countries to stop and think very carefully before starting one.

No! The Middle East is in a deadly game. Countries want to show how strong they are, but they also do not want to trigger other countries into attacking them. This is hard to get right.

FOR YOUR SUMMER READING CHALLENGE CLUE GO TO STEP SIX IN THE SIX STEPS TO DISCOVERY BELOW.

World War One - A war that included many European countries between 1914 and 1918. 

Archduke Franz Ferdinand - The heir to the throne of Austria-Hungary. He was assassinated in Sarajevo in June 1914 aged 50, which led to the start of World War One.

Hamas - A militant Palestinian organisation, which has controlled the Gaza Strip since 2007. It is listed as a terrorist organisation in the UK.

Iran - A country in Western Asia, officially called the Islamic Republic of Iran. It has a population of 84 million.

Bomb - A weapon that explodes and is used to kill or hurt people or to damage buildings.

Embarrassed - Feeling ashamed or self-conscious.

Israel - A country in the Middle East, and the only Jewish nation in the modern period. It is seen by Jews, Christians and Muslims as the Holy Land.

Experts - Someone who knows a lot about a particular subject.

Middle East - The lands around the east of the Mediterranean Sea and Arabia.

Economy - The way that money flows through a country, which affects wages and the cost of living.