World War One 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. Four years later, 20 million people had joined him in the grave.¹

So it is no surprise fears rose of a repeat when 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 Iran by what is believed to be an Israeli bomb last week.

The killing of Haniyeh was a humiliation for IranA country in Western Asia, officially called the Islamic Republic of Iran. It has a population of 84 million. . Everyone believes they will have to respond with their own attack on 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..

Then, the story goes, the two powers head into all-out war. The USA intervenes on Israel's behalf and Russia backs Iran. China takes advantage of the chaos to attack TaiwanAn island country in east Asia. China still claims to be the legitimate owner of Taiwan, while the Taiwanese government until recently claimed to be the legitimate government of the whole of China. and the USA finds itself fighting on three fronts. World War Three has broken out.

But will it happen? Experts are unsure. World War One began because many European powers believed they could win.²

This is not true in the Middle EastThe lands around the east of the Mediterranean Sea and Arabia. , where war is in no-one's interests. Iran knows all-out war with Israel would mean being dragged into deadly conflict with the powerful USA.

It would also be a disaster for Israel. The high-skilled workers in its tech sector would likely flee a war, crashing its economy.³

And war with Iran would mean fending off attacks from all directions. Most deadly is HezbollahA militant organisation based in Lebanon, classified in the UK as a terrorist group. It has made direct attacks on Israel and is believed to have been responsible for assassinating Lebanon's former Prime Minister Rafic Hariri. in LebanonA small country on the eastern Mediterranean coast that has been in the grip of an economic crisis for over a year. It has a native population of just 4.7 million, but migrants and refugees have brought its total population up to almost 7 million., which commands at least 50,000 soldiers and as many as 200,000 missiles.⁴

The most probable outcome, experts say, is that Iran finely tunes a response that is just below the threshold for Israel to declare war, and we go on as before.

Even if war did break out in the Middle East, they argue, it is not likely to escalate. The USA has shown in Ukraine that it will not risk direct fighting with Russia and resulting nuclear war.

Moreover, today the great powers are linked together by trade. War would destroy all their economies. They will do anything to avoid it.

Are we panicking?

Yes: The world is no longer set up for war. It has a single, interconnected economy in which conflict in one area can devastate the whole. Nuclear weapons deter any escalationWhen things get worse. between great powers.

No: The Middle East is stuck in a deadly game. Each party knows a display of weakness could invite more attacks, but showing too much strength could trigger war. We could end up in an accidental conflict.

Or... There will probably be no world war, but regional wars are breaking out all over the globe. It is easy to forget that much of humanity is not benefiting from the current "peace".

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

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.

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.

Taiwan - An island country in east Asia. China still claims to be the legitimate owner of Taiwan, while the Taiwanese government until recently claimed to be the legitimate government of the whole of China.

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

Hezbollah - A militant organisation based in Lebanon, classified in the UK as a terrorist group. It has made direct attacks on Israel and is believed to have been responsible for assassinating Lebanon's former Prime Minister Rafic Hariri.

Lebanon - A small country on the eastern Mediterranean coast that has been in the grip of an economic crisis for over a year. It has a native population of just 4.7 million, but migrants and refugees have brought its total population up to almost 7 million.

Escalation - When things get worse.