Prince Rupert's Drops are formed when molten glass is dripped into cold water. The glass forms a tadpole-shaped droplet with a long, thin tail, and when the inside cools, it contracts, pressing against the already-solid outer part. Due to the residual stress, the extremely hard bulbous part can withstand a blow from a hammer, but if the tail is damaged even slightly, the entire drop shatters explosively into a fine powder. Prince Rupert did not invent the drops, so why are they named for him?
Back in the day
A rocky peninsula on the southern tip of Spain, the Rock of Gibraltar was held by the Moors from 711 to 1462, annexed by Spain in 1501, and captured by the British in 1704. After more than 200 years as a British crown colony, the people of Gibraltar participated in a national referendum and rejected a proposal to transfer control of Gibraltar to Spain, choosing instead for it to remain a British territory. What were the results of a 2002 referendum proposing shared British-Spanish sovereignty?
Born on a day like today
The Indian Removal Act of 1830 forced Native Americans to leave their lands within state borders and relocate to unsettled land in the West. Brown Davis, whose mother was a Seminole, grew up on the new Indian Territory and cared for Seminoles during a cholera epidemic when she was a teen. Once the US government began dismantling tribal governments to push Oklahoma toward statehood, Brown Davis acted as the Seminoles' interpreter in court and became their first female chief, serving for how long?