1) The word "triangle" contains four vowels: I, A, E, and E.

2) As of 2023, the COVID-19 pandemic continues to impact countries worldwide, with efforts focused on vaccination campaigns, public health measures, and economic recovery.

3) The oldest known musical instrument is a flute made from a bird bone, estimated to be around 43,000 years old.

4) The game of basketball was invented by Dr. James Naismith in 1891 and has since grown into a global sport played at both amateur and professional levels.