1) The rise of remote work and digital transformation has been accelerated by the COVID-19 pandemic, leading to changes in work dynamics, reliance on digital technologies, and the reimagining of traditional office spaces.

2) The highest-grossing concert tour of all time is U2's "360° Tour," which earned over $735 million in ticket sales.

3) The concept of federalism involves the division of powers between a central government and regional or local governments, allowing for shared governance and autonomy for different levels of administration.

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