1) The ocean covers about 71% of the Earth's surface and contains roughly 97% of the planet's water.

2) The development of blockchain technology, first introduced in 2008 with the creation of Bitcoin, has enabled secure and decentralized digital transactions and led to the emergence of cryptocurrencies.

3) Mountains are formed through various geological processes, including tectonic plate movements, volcanic activity, and erosion.

4) The world's oldest university, Al-Qarawiyyin, was founded in 859 AD and is located in Fez, Morocco.