Context: Death from laughter is a rare form of death, usually resulting from cardiac arrest or asphyxiation, caused by a fit of laughter. Instances of death by laughter have been recorded from the times of ancient Greece to the modern day.
 Question: can you have a heart attack from laughing Context: Thousands of box turtles are collected from the wild every year for the domestic pet trade, primarily from South Carolina, the only remaining state where they can legally be captured from the wild and sold for profit. Captive turtles may have a life span as short as three days if they aren't fed, watered, and held in a proper container. The vivid shell color found in many eastern box turtles often fades when a turtle is brought into captivity. This has led to the mistaken belief that the color fades as the turtle ages. The truth is that insufficient access to full sunlight causes the color in the keratin layer to fade. The eastern box turtle is protected throughout most of its range but many states allow the capture and possession of box turtles for personal use. Captive breeding is fairly commonplace, but not so much that it can supply the market demand. Although box turtles may make hardy captives if their needs are met, and are frequently kept as pets, they are not easy turtles to keep, owing to their many specific requirements. Eastern box turtles require high humidity, warm temperatures with vertical and horizontal thermal gradients, suitable substrate for burrowing, and full spectrum ultraviolet lighting that mimics sunlight. A basking area at one end of the enclosure is important to offer the turtle the ability to warm itself and is critical to sexually mature males and females for development of sperm and egg follicles respectively.
 Question: can an eastern box turtle be a pet Context: During the Beagle survey expedition, the young naturalist Charles Darwin had remarkable success with fossil hunting in Patagonia. On 10 October 1833, at Santa Fe, Argentina, he was ``filled with astonishment'' when he found a horse's tooth in the same stratum as fossil giant armadillos, and wondered if it might have been washed down from a later layer, but concluded this was ``not very probable''. After the expedition returned in 1836, the anatomist Richard Owen confirmed the tooth was from an extinct species, which he subsequently named Equus curvidens, and remarked, ``This evidence of the former existence of a genus, which, as regards South America, had become extinct, and has a second time been introduced into that Continent, is not one of the least interesting fruits of Mr. Darwin's palæontological discoveries.''
 Question: are there any predecessors or extinct species horses Context: In optics, a virtual image is an image formed when the outgoing rays from a point on an object always diverge. The image appears to be located at the point of apparent divergence. Because the rays never really converge, a virtual image cannot be projected onto a screen. In diagrams of optical systems, virtual rays are conventionally represented by dotted lines. Virtual images are located by tracing the real rays that emerge from an optical device (lens, mirror, or some combination) backward to a perceived point of origin.
 Question: can you see a virtual image on a screen
Yes
Yes
Yes
No