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: Diesel fuel pumps operate at a much higher pressure due to the engine's specs and are usually mechanical pumps such as common rail radial piston pump, common rail two piston radial, inline pump, port and helix, and metering unit design. Radial piston pumps used in cars and trucks are fuel lubricated, this helps with keeping oil out of the high pressure fuel. Oil in the fuel can raise emissions and clog injectors. Many diesel engines are common rail, which means all the injectors are supplied by one pipe full of high pressure fuel supplied by the fuel pump. Common rails dampen the pressure fluctuations when fuel is used by each injector and pumped into the cylinder. Common rails also make it easier for the fuel pressure to be measured by one device instead of one per cylinder. Port and Helix (plunger type) high pressure fuel pumps are most commonly used in marine diesels because of their simplicity, reliability, and its ability to be scaled up in proportion to the engine size.
 Question: does a diesel engine have a fuel pump Context: Collard greens are a staple vegetable in Southern U.S. cuisine. They are often prepared with other similar green leaf vegetables, such as kale, turnip greens, spinach, and mustard greens in the dish called ``mixed greens''. Typical seasonings when cooking collards are smoked and salted meats (ham hocks, smoked turkey drumsticks, smoked turkey necks, pork neckbones, fatback or other fatty meat), diced onions, vinegar, salt, and black pepper, white pepper, or crushed red pepper, and some cooks add a small amount of sugar. Traditionally, collards are eaten on New Year's Day, along with black-eyed peas or field peas and cornbread, to ensure wealth in the coming year. Cornbread is used to soak up the ``pot liquor'', a nutrient-rich collard broth. Collard greens may also be thinly sliced and fermented to make a collard sauerkraut that is often cooked with flat dumplings.
 Question: are collard greens the same as mustard greens Context: Angular frequency (or angular speed) is the magnitude of the vector quantity angular velocity. The term angular frequency vector ω → (\displaystyle (\vec (\omega ))) is sometimes used as a synonym for the vector quantity angular velocity.
 Question: is angular velocity the same as angular frequency Context: Keystone Corridor: According to Transrapid, Inc., Pittsburgh has the most advanced maglev initiative in the U.S., followed by the Las Vegas project. Once federal funding is finalized, these two markets could be the first to see maglev in the United States. Initially, the project calls for a transrapid system throughout the metro Pittsburgh area. Further planning calls for extensions eastward to Harrisburg and Philadelphia. Upon completion, a commute from Pittsburgh to Philadelphia would be reduced to 90--120 minutes. A commuter traversing the Pennsylvania Turnpike would currently spend approximately 5hrs if traveling at the speed limit.
 Question: are there any maglev trains in the united states
Yes
Yes
No
No
No