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Build an artificial wall that closes the Strait of Gibraltar.

What if Iran not only gained nuclear weapons before its Islamic Revolution in 1979 but also kept those nuclear weapons after 1979? I'm not sure why this would be the case, but deterring possible Soviet encroachment seems like a reasonable justification. Before the Shah was overthrown, he was...

Give Islam an equivalent to the Pope.

Create an industrialisation process that is widely considered to be the Third Industrial Revolution.

Every animated film in cinemas these days seems to be 3D. How can 2D animated films stay in cinemas?

I admit that I have no idea how the Americas could be decolonised, but if this actually happened, what would the Americas be like today? I think that the borders of sovereign states in the Americas would be drawn along ethnolinguistic lines and there might be many more countries in the Americas...

Most of the world uses the base-ten numeral system. But what if most of the world used a different numeral system (like base-three or base-six, for example)? How would the world be different if a different numeral system was used worldwide?

Your challenge in this thread is to make polyandry (i.e. one woman having more than one husband simultaneously) not only common in the world today, but also accepted in mainstream society today.

Create a state populated by native speakers of Indo-Iranian languages consisting of Pre-Partition India, Afghanistan, Nepal, the Maldives, Iran and Sri Lanka and ensure that this state survives to the present day.

Make Australia an ancient Indian colony.

Make Dubai the world's most socially liberal city in the present.