Eric Aeberhard, from Switzerland, looks through the rubber device he designed to facilitate opening and closing screw-top bottles

Taiwan's Ryan Liu poses with his invention, an interactive instant message-based toy that changes its face according to the smiley received on a computer

Heina Gruber, of Germany, presents his invention, a hot-air rotating grill, in which meat, fish and vegetables are roasted vertically

Fabrice Leblat, of France, presents his Leblatphone, a portable speaking machine programmed with several languages, for non-native speakers

Cosimo Letteriello, an Italian, poses with his invention, the Trespolo - a case with a tripod that turns into a workstation

Italian Enrico Berruti with his self-making-bed invention, which has two lateral arms for handling bed linen

Brazilians Amarildo Miranda Melo and Edemar Antonini pose with their invention, an economical toilet apparatus that flushes with only three litres of water instead of nine