1) The word "country" contains three vowels: O, U, and Y.

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) The first bank in the world, Banca Monte dei Paschi di Siena, was established in Italy in 1472 and is still in operation today.

4) The Great Wall of China is not visible from space without aid, contrary to popular belief.