Part 608, section 3.2 of the DMM (U.S. Domestic Mail Manual) groups holidays into ''Widely Observed'' and ''Not Widely Observed''. Holidays ''Widely Observed'' include New Year's Day, Memorial Day, Independence Day, Labor Day, Thanksgiving Day, and Christmas Day. Holidays ''Not Widely Observed'' are Martin Luther King, Jr.'s Birthday; Presidents Day; Columbus Day; and Veterans Day.

will mail be delivered on monday memorial day?

A: no

A unique, stimulus-specific set of mast cell mediators is released through degranulation following the activation of cell surface receptors on mast cells. Examples of mediators that are released into the extracellular environment during mast cell degranulation include:

is a cell surface receptor on the mast cell?

A: yes

In the history of the Triple Crown, 13 horses have won all three races: Sir Barton (1919), Gallant Fox (1930), Omaha (1935), War Admiral (1937), Whirlaway (1941), Count Fleet (1943), Assault (1946), Citation (1948), Secretariat (1973), Seattle Slew (1977), Affirmed (1978), American Pharoah (2015), and Justify (2018). As of 2018, American Pharoah and Justify are the only living Triple Crown winners.

has any horse won triple crown since secretariat?

A: yes

A water-fuelled car is an automobile that hypothetically derives its energy directly from water. Water-fuelled cars have been the subject of numerous international patents, newspaper and popular science magazine articles, local television news coverage, and websites. The claims for these devices have been found to be pseudoscience and some were found to be tied to investment frauds. These vehicles may be claimed to produce fuel from water on board with no other energy input, or may be a hybrid claiming to derive some of its energy from water in addition to a conventional source (such as gasoline).

is there an engine that runs on water?

A:
no