Before it sank, it had been travelling for less than five days.
How long had the Titanic been traveling before it sank?
They have discovered more than 5,000 exoplanets so far.
How many exoplanets have scientists discovered so far?
The Amazon rainforest produces a significant amount of the world's oxygen.
What does the Amazon rainforest produce?
Yes, by the time the first smartphones became popular, they had already been used for many years.
Had mobile phones been used for many years by the time the first smartphones became popular?
If they had not become extinct, the development of life on Earth might have been very different.
What might/would have been different if dinosaurs had not become extinct?
Only a small percentage of the ocean has been fully explored.
How much of the ocean has been fully explored?
It was written by William Shakespeare.
Who wrote (Romeo and Julieth)?
To explore deeper areas of the ocean, governments are currently developing new technologies.
What are governments currently developing to explore deeper areas of the ocean?
By the end of this century, it will have increased significantly.
How much will global temperature have increased by the end of this century?
English is spoken as a first or second language in many parts of the world.
Where is English spoken as a first or second language?
It was originally built for the 1889 World's Fair.
Why was the Eiffel Tower originally built?
People have been using the Great Wall of China as a defensive structure for many centuries.
How long have people been using the Great Wall of China as a defensive structure?
Jupiter is the largest.
Which is the largest planet in the solar system?
Yes, at this time next year, NASA scientists will be studying new data from space missions.
Will NASA scientists be studying new data from space missions at this time next year?
Humans first landed there in 1969.
When did humans land on the Moon for the first time?