This Day in History

USSR Begins Drilling World's Deepest Hole (1970)
The Kola Superdeep Borehole project was an attempt to dig as far as possible into the Earth's crust. It began when, in 1970, following setbacks in the Space Race, Soviet scientists looked downward. Digging on the remote Kola Peninsula for some 20 years, they reached a depth of 40,230 feet (12,262 m)—about a third of the way through the Earth's crust—before being forced to stop due to higher-than-expected temperatures of 350° F (180° C). Surprisingly, water was found at what depth? Discuss

New York Public Library Dedicated (1911)
When former New York governor Samuel J. Tilden died in 1886, he left $2.4 million in his will for the creation of a grand public library. At that time, there were two other important libraries in New York City—the Astor and the Lenox—but they were struggling. With Tilden's gift, they were merged in 1895. The new library's cornerstone was laid in 1902 at the old Croton Reservoir on Fifth Avenue, and it finally opened to the public in 1911. By 1910, how many miles of shelves had been installed?

Farmer Discovers Howe Caverns (1842)
Howe Caverns is a cave system in east-central New York that lies 156 ft (48 m) below ground. It was discovered in 1842, when farmer Lester Howe began to wonder why his cows all seemed to gather near one particular hill on hot summer days. Upon investigating, he felt a cool breeze blowing from a hole in the hill. He and a neighbor began to dig out the hole and uncovered the entrance to a cave. They explored it extensively and opened it for tours the next year. Why are there boats in the cave?