Is the raptor in the movie Jurassic Park a real dinosaur? It is actually based on the velociraptor. The velociraptor was a carnivore also known as the 'speedy thief'. It was about two metres long, one metre tall and may have weighed seven to 15 kilograms. It had about 30 very sharp, curved teeth in a long, flat snout, an s-shaped neck, long thin legs, arms with three-fingered clawed hands and four-toed clawed feet. The brain of the velociraptor was very large compared with its body size, so it was among the most intelligent of dinosaurs. The velociraptor lived in the late Cretaceous period, about 80 million to 85 million years ago. Among the contemporaries of the velociraptor were the protoceratops and oviraptor. Velociraptors were meat- eaters. They ate just about anything they could tear apart and were among the fastest of dinosaurs. In 1971, fossils of a velociraptor and a protoceratops were found together. Apparently, the velociraptor was attacking the protoceratops with its claws and the armoured head of the protoceratops had apparently pierced the chest of the velociraptor and the two died together. The velociraptor was first found and described by H F Osborn in Mongolia in 1924. More than 10 velociraptor fossils have been found in Mongolia, Russia and China. Why do some countries have summer time and winter time? MARGHERITA The hours of sunlight vary during the year. In the summer, the sun rises earlier and sets later, so there are more hours of daylight. In the winter, the reverse happens, with the sun rising later and setting earlier, resulting in shorter days. Because Hong Kong is in the tropics, there is not a great difference between the hours of daylight in the summer and those in the winter. However, in more northerly latitudes, the coming of winter means much shorter days. In mid-winter in places close to or inside the arctic (or antarctic) circle, the sun does not rise above the horizon for weeks or months - it's permanent night, well until spring anyway. Because clocks keep their own time rather than following the movements of the sun, in summer the clocks in some countries are set one hour ahead to give an extra hour of daylight in the evening. This time is called daylight-saving time, or summer time. In winter, the clocks are set back one hour to return them to standard time. During World War I, summer time was adopted by Britain, France, Germany and several other countries. The move was to save fuel, no doubt so it could be used in the war effort rather than for environmental reasons. The United States briefly adopted summer time between 1918 and 1919, during World War II and then re-established it during the energy crisis of 1973. Hong Kong also adopted sum mer time in the '70s to save fuel during the energy crisis. The mainland briefly experimented with summer time in the late 1980s, which led to a bit of confusion over train timetables for people travelling between Hong Kong and the mainland.