1) A newborn kangaroo is about 1 inch (2.5 centimeters) long and weighs less than a gram.

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

3) The role of the media in politics is to provide information, analysis, and scrutiny of government actions, policies, and public affairs, serving as a watchdog and facilitating public discourse and transparency.

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