If this question had a simple answer, such as a formula that could be learned, you can be sure that every
comedian would know it! But laughter is a complicated things, and the best explanations of it are still
only theories. We know, of course, that laughter is an expression of many feelings and that laughter is
only found among human beings. It is difficult to decide what really makes people laugh, because each
person will find a different thing funny. It is all down to being individuals. From the physical point of
view, laughter is very good for us. It is good for our lungs, and it is an outlet for some extra energy. So
although no one really knows what makes people laugh, or what the purpose of laughter is, it is a very
good medicine and certainly makes us feel better.

Early man had to rely on his own muscle-power to carry objects, but over thousands of years tamed
animals, such as horses, oxen and donkeys, elephants and camels. In order to be able to transport more
goods than an animal could carry on its back, sledges and hurdles that could be pulled behind the animal
were eventually invented, as well as such instruments as ploughs to make agriculture easier. Where
sledges were not suitable, such as on rough ground or sand, the could roll heavy objects along on top
of logs, continually taken from behind the object as it passed and placed in front of it. It is thought that
stones for both the pyramids and Stonehenge may have been moved using this technique. Eventually,
someone realized that attaching the logs, or sections of log, to the object would be more efficient and

There are more than 150 species of octopus, ranging from the very small to the giant octopus, which
may reach 33ft (10m) in length. Most of them eat crabs, fish, crustaceans and smaller mollusks, which
they catch and tear apart with their suckered tentacles. An octopus’ mouth is shaped like a parrot’s
beak, with two very strong jaws. In addition the octopus can inject venom or poison with its bite,
which enables it to disable prey that might fight back, such as crabs, more quickly. Octopses are very
intelligent, curious animals, with a highly developed nervous system and extremely good eyesight.
They propel themselves through the ocean by squirting water from the edge of their mantle. They are opportunistic feeders , which means that they will tackle almost anything when they are hungry!