Is democracy its biggest victim? We have long believed that the key to living freely is being able to discuss ideas and search for truth. Now some fear truth is dead.
Truth is dead in our sinister era say experts
Self-belief age: When Donald Trump was asked who advises him on foreign affairs, he cited himself. Glossary
Democracy - A system of government based on the idea of rule by the people.
Experts - Someone who knows a lot about a particular subject.
Threats - Something which is likely to cause danger.
Elon Musk - A South African-born entrepreneur whose companies have included the online payment service PayPal. He now controls Twitter, renamed 'X'.
Climate change - Long-term shifts in temperatures and weather patterns. Human action is a major cause of climate change.
Deep fakes - When AI is used to make convincing fake video, audio and images.
AI - A computer programme that has been designed to think.