Humulone (α-lupulic acid), a vinylogous type of organic acid, is a bitter-tasting chemical compound found in the resin of mature hops ("Humulus lupulus").
 Humulone is a prevalent member of the class of compounds known as alpha acids, which collectively give hopped beer its characteristic bitter flavor.
The Handley Page Type D or H.P.4 was a single-seat, single-engined tractor monoplane, the first Handley Page design to fly for more than a few hops.
 Only one was built.
A small-world network is a type of mathematical graph in which most nodes are not neighbors of one another, but the neighbors of any given node are likely to be neighbors of each other and most nodes can be reached from every other node by a small number of hops or steps.
 Specifically, a small-world network is defined to be a network where the typical distance "L" between two randomly chosen nodes (the number of steps required) grows proportionally to the logarithm of the number of nodes "N" in the network, that is:
Hops are the flowers (also called seed cones or strobiles) of the hop plant "Humulus lupulus."
 They are used primarily as a flavoring and stability agent in beer, to which they impart bitter, zesty, or citric flavours; though they are also used for various purposes in other beverages and herbal medicine.
 The hop plant is a vigorous, climbing, herbaceous perennial, usually trained to grow up strings in a field called a hopfield, hop garden (nomenclature in the South of England), or hop yard (in the West Country and U.S.) when grown commercially.
 Many different varieties of hops are grown by farmers around the world, with different types being used for particular styles of beer.
Alisma is a genus of flowering plants in the family Alismataceae, members of which are commonly known as water-plantains.
 The genus consists of aquatic plants with leaves either floating or submerged, found in a variety of still water habitats around the world (nearly worldwide).
 The flowers are hermaphrodite, and are arranged in panicles, racemes, or umbels. "Alisma" flowers have six stamens, numerous free carpels in a single whorl, each with 1 ovule, and subventral styles.
 The fruit is an achene with a short beak.
A Wild Mouse roller coaster (also Mad Mouse or Crazy Mouse) is a type of roller coaster characterised by small cars that seat four people or fewer and ride on top of the track, taking tight, flat turns (without banking) at modest speeds, yet producing high lateral G-forces.
 The track work is characterised by many turns and "bunny hops", the latter producing abrupt negative vertical G forces.
 When approaching a turn from a straight section the intended impression is that one will simply continue straight, and thus plunge off of the device, this since there are no transition sections as are in a conventional high speed coaster track and the turn itself is obscured upon close approach.
 Almost all Wild Mice feature "switchback" sections, consisting of several of these unbanked turns, separated by straight sections.
 Usually the turns on the switchback section are 180°, but some coasters feature 90° turns as well as more rarely steep runs with loops (for example Crazy Mouse at Tobu Zoo in Japan, which is no longer operating).
 Some riders, usually among taller people, report sustaining whiplash after being subjected to these turns.
Ale is a type of beer brewed using a warm fermentation method, resulting in a sweet, full-bodied and fruity taste.
 Historically, the term referred to a drink brewed without hops.
Pilsner Urquell (] , Czech: "Plzeňský prazdroj" ] ), is a Czech lager brewed in Plzeň, Czech Republic by Pilsner Urquell Brewery.
 Pilsner Urquell is the world’s first-ever pilsner type blond lager, making it the inspiration for much of the beer produced in the world today, many of which are named "pils", "pilsner" and "pilsener".
 It is hopped with Saaz hops, a noble hop variety which is a key element in its flavour profile, as is the use of soft water and fire-brewing.
 It is available in 330 ml, 355 ml and 500 ml aluminium cans and green or brown bottles.
Xanthohumol is a natural product found in the female inflorescences of "Humulus lupulus", also known as hops.
 This compound is also found in beer and belongs to a class of compounds that contribute to the bitterness and flavor of hops.
 Xanthohumol is a prenylated chalconoid, biosynthesized by a type III polyketide synthase (PKS) and subsequent modifying enzymes.

Question: Hops and Alisma, are a type of what?
Answer: plant