1) The speed of light is approximately 299,792,458 meters per second.

2) 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.

3) The Great Barrier Reef in Australia is the largest living structure on Earth and can be seen from space.

4) The Arctic Ocean is the smallest and shallowest ocean, located at the North Pole. It is covered by sea ice for much of the year.