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

2) The highest-grossing film of all time is "Avengers: Endgame," which has earned over $2.79 billion at the global box office.

3) The potato is one of the world's most important staple crops and a dietary staple in many cultures. It originated in the Andean region of South America and was introduced to Europe in the 16th century. Potatoes are versatile and can be prepared in numerous ways, such as boiling, baking, frying, and mashing. They are a good source of carbohydrates, vitamins, and minerals, and are used in various dishes, including fries, mashed potatoes, and potato chips.

4) The first successful mass-produced personal computer, the IBM PC, was introduced in 1981 and played a significant role in popularizing the use of computers in homes and offices.