Ingrown toenail. An ingrown toenail occurs when the edge of the nail grows down and into the skin of the toe. Causes. An ingrown toenail can result from a number of things. Poorly fitting shoes and toenails that are not properly trimmed are the most common causes. The skin along the edge of a toenail may become red and infected.
Best Answer: It depends on your height above the surface of the water. where h is the height above ground or sea level (in meters) of the eye of the observer. For an observer standing at sea level with h = 1.70 metres (5 ft 7 in) (average eye-level height), the horizon is at a distance of 4.7 kilometres (2.9 mi).
When in a tall building, the horizon can be as far as about 40 miles. From the ISS, the distance to the horizon is over 1000 miles. So from horizon to horizon, the section of the Earth you can see at any one time is a patch about 2000 miles across, almost enough to see the entire United States at once.