It’s possible to sail in a straight line from Pakistan to Siberia — a carefully plotted great-circle route will thread a line between Madascar and the African mainland, between Tierra del Fuego and Antarctica, and through the Aleutian Islands to arrive at the Kamchatka Peninsula, a total distance of nearly 20,000 miles, about 80 percent of the Earth’s circumference. You can reverse course to get back to Karachi.

(Thanks, Derek.)