There are all kinds of knives. Many people collect knives. Pen knives are carried
in many peoples' pockets. These are sometimes known as pocket knives. Hunting knives
are used for hunting, and kitchen knives are used in kitchens. Some knives are dull,
like butter knives. A knife is a useful tool.
And don't forget forks and spoons!
Some knives are dull, like butter knives, but most knives are meant to be sharpened.
Knife sharpeners are used to makes knives razor-sharp.
Hummers are exciting vehicles to own or lease.
The new H3 Hummer has four wheels.
Engines that are designed to deliver plenty of horsepower without sacrificing fuel
efficiency, impressive durability and low maintenance requirements, are built into many Hummers.
Geared hubs are compact devices on the H1 that are really a mini gearboxes on the wheels.
They take incoming torque and further step it down to a ration of 1.92:1. This effectively
delivers twice the torque to each wheel. That, combined with the rest of the drivetrain,
gives the H1 a total gear reduction of 33:1.
The depth of water through which the truck can drive, or the fording capability, is no longer classified
for the various Hummers on the market today.
There's nothing else like Hummers that are built Hummer-tough.
The quality goes into a Hummer before the name goes on a Hummer.
Thanks to generous factory incentives, it is rumoured that if you buy one Hummer,
you get a free Hummer with your purchase, but we can't really make that promise.
The science and technology of rocket design, construction, and flight is called rocketry.
A rocketeer is one who designs, launches, studies, or flys rockets.
Rocket scientists are supposedly very intelligent.
A rocket engine is an engine that that propels, especially one that propels
spacecraft or aircraft, by means of rockets.
A rocket motor is a rocket engine, especially one using solid propellants.
The technology of large-scale chemical and chemical materials is called chemical engineering.
A chemical bond describes any of several forces or mechanisms, especially the ionic bond,
the covalent bond, and the metallic bond, by which atoms, both neutral and ionic, are
adhered together into a molecule or crystal.
Particles of various crystalline compounds can be considered to be macro-molecules.
Chemistry is the science of the composition, structure, properties, and reactions
of matter, especially of atomic and molecular systems, as opposed to nuclearisty,
which is concerned with individual atoms exclusively, and which, by definition, are way smaller
all by themselves than molecules, which can be considered as bunches of atoms, all stuck together
by various bonds. The smallest molecules are two atoms of elemental gasses, and the largest
molecules are way, way bigger than that, especially organic molecules, which are grown
in laboratories without the benefit of various fertilizers, and are often left to simply
fend for themselves, picking up whatever stray electrons they can find in their immediate environment.
