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

2) The global response to climate change includes the Paris Agreement, an international treaty aiming to limit global warming and strengthen countries' efforts to address climate change through mitigation and adaptation strategies.

3) The first commercially available digital camera, the Dycam Model 1, was introduced in 1990 and had a resolution of 376 x 240 pixels.

4) The concept of gravity was famously described by Sir Isaac Newton after an apple fell on his head.